{"id":"64bc45d2-6d4a-4ec1-8a8a-18c5785b80bf","arxiv_id":"2608.07811","paper_version":1,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":6,"one_line_summary":"Asymmetric top M-NH2 molecules are shown to offer long-lived ground-state parity doublets and engineered clock transitions that project electron EDM sensitivity beyond current limits.","lead":"This paper models alkaline-earth monoamide molecules such as SrNH2 and RaNH2 and shows how to engineer field-insensitive quantum states for electron electric dipole moment (EDM) searches inside an optical trap. If the calculations hold, these molecules could reach electron EDM sensitivity roughly ten times beyond the current best experiments.","discovery_kind":"new_application","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The RaNH2 projection rests on an unvalidated spin-rotation tensor that is off by roughly a factor of two wherever it can be checked; a quantitative parameter-sensitivity scan is needed before the 1e-31 e·cm estimate is treated as robust.","rationale":"I agree with the reader's conditional assessment. The paper is careful: it refits geometries, compares FS-CCSD to experiment wherever possible, and explicitly flags the BaNH2/RaNH2 CCSD(T) gap and the roughness of the polarizability model. The single most load-bearing uncertainty is the RaNH2 spin-rotation tensor because it directly controls the clock-transition engineering that supplies the ⟨ΔΣ⟩ = 0.8 input to the projected sensitivity. The factor-of-two discrepancy in Table I is a demonstrated class of error, not speculation. This does not warrant rejection: the qualitative message, that ATMs host abundant field-insensitive parity-doublet transitions, is supported by the catalog and by the apparent generality of the crossing structure, and the projection is explicitly conditional. However, the headline numerical claim should not be read as a validated reach statement until the spin-rotation tensor is either measured, computed at CCSD(T) level, or shown by a parameter scan not to change the best transition's figure of merit. Hence the reader's CONDITIONAL verdict stands unchanged.","tokens_in":43727,"tokens_out":8113,"duration_ms":78324,"concrete_test":"Recompute the Section IV transition search for Ra14NH2 and Ra15NH2 with ϵ_aa scaled by the empirical FS-CCSD correction factors (×1.8 and ×2.0) and with a CCSD(T)-extrapolated value around 700-900 MHz, holding all other Table I constants fixed. If the best catalog entry retains |ΔΣ| ≳ 0.7 and F ≳ 10 somewhere in the stated (E,B) ranges, the headline projection is robust; if the best F falls below the headline implied value F ≈ 2.5 (|ΔΣ| = 0.8, τ = 10 s), the 1e-31 e·cm projection is contingent on an unvalidated input.","verdict_should_be":"UNCHANGED","load_bearing_attack":"Section V's projected sensitivity δde ≈ 1e-31 e·cm uses ⟨ΔΣ⟩ = 0.8, a value taken from the RaNH2 N=1, K_a=1 clock transitions in Table II. Those transitions are computed with the FS-CCSD spin-rotation tensor. Table I shows the same method underestimates ϵ_aa by about 1.8x for CaNH2 (25.2 vs 45.7 MHz) and 2.0x for SrNH2 (80.4 vs 160.1 MHz); CCSD(T) improves the agreement but remains 20-30% low, and Section III states that CCSD(T) was intractable for BaNH2 and RaNH2. Since ϵ_aa = 496 MHz for RaNH2 drives the avoided crossings that produce the f_E = f_B = 0 operating points, a factor-of-two error can shift those points and alter the wavefunction composition, changing both |ΔΣ| and the curvature-limited τ_EM. The paper states that transitions occur 'generally even when effective Hamiltonian parameters are varied,' but no quantitative parameter-sensitivity scan is shown. If the true RaNH2 tensor moves the best transition to lower |ΔΣ| or shorter τ_EM, the projected sensitivity could lose its claimed order-of-magnitude margin over the current 2e-30 e·cm limit, even though the qualitative existence of parity-doublet-based EDM schemes would survive.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"The paper proposes asymmetric top molecules of the M–NH2 family (M = Ca, Sr, Ba, Ra) as a platform for electron-EDM searches. It combines relativistic FS-CCSD calculations of molecular constants with an effective-Hamiltonian diagonalization of the N=1, K_a=1 manifolds of SrNH2 and RaNH2, and it identifies many field-insensitive clock transitions with large differential EDM sensitivity. It also analyzes optical-trap light shifts and proposes magic-angle polarization tuning to suppress differential ac Stark shifts. The central projection, in Section V, is that RaNH2 with Wd = 110 GV/cm, |ΔΣ| = 0.8, Np = 10^3, τ = 10 s, and T = 1 week gives δde ≈ 1×10^-31 e·cm, more than an order of magnitude beyond the current best statistical sensitivity of 2×10^-30 e·cm.","tokens_in":44041,"tokens_out":6340,"duration_ms":59697,"significance":"If the quantitative RaNH2 predictions were reliable, the paper would establish C2v asymmetric tops as a practical route to very long coherence times in EDM searches, complementing recent laser-cooling demonstrations in CaNH2. The paper's strengths are its systematic effective-Hamiltonian machinery, the transparent catalog of transition statistics in Appendices B and C, and the honest reporting of discrepancies between FS-CCSD and experimental spin-rotation constants in Table I. The qualitative message — that ATMs generically host many engineered field-insensitive transitions with strong EDM sensitivity — is well supported. The headline quantitative claim, however, is not yet robust because it rests on an unvalidated RaNH2 spin-rotation tensor and on a crude polarizability estimate. The 'circularity' concern raised in the stress-test does not land: the sensitivity formula is a stated conditional projection with assumed apparatus parameters, not a fitted target; the problem is uncertainty in the molecular inputs, not circular reasoning.","major_comments":[{"comment":"The headline projection δde ≈ 1×10^-31 e·cm uses ⟨ΔΣ⟩ = 0.8 and τ = 10 s from the RaNH2 transitions in Table II, which are computed with the FS-CCSD spin-rotation tensor. Table I shows that FS-CCSD underestimates ε_aa by a factor of roughly 1.8 for CaNH2 (25.2 vs 45.7 MHz) and 2.0 for SrNH2 (80.4 vs 160.1 MHz); CCSD(T) improves the agreement but remains low, and Section III states that CCSD(T) is intractable for BaNH2 and RaNH2. Since ε_aa = 496 MHz drives the avoided crossings that produce the f_E = f_B = 0 operating points, a factor-of-two error can shift these points and change the wavefunction composition, thereby changing both |ΔΣ| and τ_EM. The statement in Section IV B that such transitions occur 'generally even when effective Hamiltonian parameters are varied' is not quantified anywhere in the manuscript. I request a parameter-sensitivity study over ε_aa (and ideally the full set of Hamiltonian parameters) spanning at least the observed FS-CCSD error ranges, with the resulting changes in F = |ΔΣ|√τ_EM and in δde reported. Without such a study, the claimed order-of-magnitude margin over the current 2×10^-30 e·cm sensitivity is not established.","section":"Section IV C, Appendix C 1"},{"comment":"The trap analysis uses dynamic polarizabilities estimated from a pure-precession model with atomic D-line strengths, with the text itself noting up to 50% uncertainty in the anisotropies. The magic-angle cancellation and figure-of-merit recovery in Figure 5 and Appendix C 2 are tested on a grid with the scalar polarizability fixed and with T2_0 varied by ±20% and T2_±2 scaled from -1 to 3 times the estimated value, but this grid does not map the full estimated uncertainty of the individual α_aa, α_bb, α_cc components. Because the τ = 10 s coherence assumed in Section V requires the optical trap to be magic, the projection should be tested under a more systematic polarizability-uncertainty model, or the projection should be explicitly conditioned on a future full dynamical-polarizability calculation.","section":"Section IV B, Appendix B"},{"comment":"The catalog in Table III shows that field-insensitive transitions are abundant, so the qualitative existence claim is robust. However, the specific headline transition for Ra14NH2, M(-3/2 → +1/2) in Table II, is selected as the maximum-F candidate from a Hamiltonian built on calculated rather than measured hyperfine and spin-rotation constants. The manuscript does not report any uncertainty or range for the F value of this transition, nor for the values of |ΔΣ| and τ_EM that enter the Section V projection. I recommend adding a sensitivity table for the eight listed transitions, showing how (E*, B*), |ΔΣ|, τ_EM, and F change when the input constants are perturbed within the errors suggested by Table I and by the FS-CCSD/CCSD(T) comparison.","section":"Section II B"}],"minor_comments":[{"comment":"Eq. (13) defines D ≡ Rτ, but the Section V formula δde = ℏ/(Wd |ΔΣ| √(τ Np T)) assumes R = 1/τ. Please state explicitly that the projection uses a coherence-time-limited repetition rate with no multiplexing.","section":"Table IV"},{"comment":"The table caption says entries below 0.1% are shown as upper bounds, but the upper-bound value is not defined. Please specify the actual threshold and whether the displayed value is 0.1% or a smaller bound.","section":"Introduction"},{"comment":"The abstract and introduction state that ATMs 'combine large electric polarizability with long coherence times,' but the large polarizability is a model estimate rather than a measured quantity. Suggest softening this wording until measurements exist.","section":"Appendix C 1"},{"comment":"The spherical-tensor components T2_0 and T2_±2 of the polarizability are used in the stability grid but are not defined explicitly in terms of α_aa, α_bb, α_cc. A one-line definition would make the grid description self-contained.","section":"Section IV B"},{"comment":"The sentence 'The term f_EB is particularly of importance as it scales any non-reversing correlated noise, which could provide a false EDM' appears to refer to a systematic error rather than incoherent noise. Please clarify the distinction between correlated noise and a false EDM signal.","section":"Appendix D"}],"recommendation":"major_revision","confidential_remarks":"I agree with the conditional assessment in the reader's report. The central qualitative claim is sound, but the quantitative RaNH2 projection needs a parameter-sensitivity analysis before the paper can be accepted. The paper is within scope for physics.atom-ph, and the requested revision is feasible within the manuscript's scope."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"Colleague,\n\nThe thing to know: this is a careful computational port of the clock-transition and magic-angle methods from linear triatomics to asymmetric tops. The catalog of field-insensitive transitions and the new ab initio hyperfine constants for the M–NH2 family are genuinely new, and the trap-shift analysis goes further than most theory papers in this area. But the headline RaNH2 sensitivity sits on a spin-rotation tensor that is off by roughly a factor of two wherever it can be checked, and the paper never shows how the clock transitions move under such variations. Treat the 1e-31 e·cm projection as conditional, not a result.\n\nWhat is good: the effective-Hamiltonian machinery is standard but applied cleanly; the systematic search over (E,B) yields many useful transitions; the K-doublet lifetime estimates in the appendix are physical and the authors are honest about needing cryogenic shielding for τ=10 s. They also flag that the polarizability model is a crude estimate, and they test an 18-point tensor grid, which is more robustness checking than one usually sees.\n\nSoft spots, in proportion. The load-bearing input is the RaNH2 spin-rotation tensor. Table I shows FS-CCSD underestimates ε_aa by 1.8–2× for CaNH2 and SrNH2; CCSD(T) improves to 20–30% low, but it was intractable for Ba/Ra. The paper asserts that field-insensitive transitions 'occur generally even when effective Hamiltonian parameters are varied,' but no quantitative scan is shown. A factor-of-two error in ε_aa could shift the operating points and lower |ΔΣ| or τ_EM enough to eat the claimed order-of-magnitude margin. The qualitative point—ATMs host useful parity doublets for EDM searches—survives, but the headline number is fragile. The polarizability model is the second soft spot, though the magic-angle conclusions look robust to their grid. No code or data artifacts are deposited, which makes the catalog harder to reproduce, though the matrices are in the appendices. The YbNH2 mention in the abstract is broader than the actual calculation, and the authors acknowledge it.\n\nWho benefits: anyone working on molecular eEDM, polyatomic laser cooling, or quantum control of molecules. It deserves serious peer review. My recommendation: send it out, and ask for a parameter-sensitivity scan on the RaNH2 spin-rotation tensor—or a softened headline. That is a revision, not a rejection.","headline":"Solid port of clock-transition and magic-angle methods to asymmetric tops, but the RaNH2 sensitivity projection leans on an unvalidated spin-rotation tensor.","tokens_in":44646,"tokens_out":4698,"would_cite":true,"duration_ms":40191,"reading_group":"yes","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"Alkaline-earth monoamides, as asymmetric tops, offer long-lived parity doublets and engineered clock transitions that project an electron-EDM sensitivity of about 1e-31 e·cm, more than an order of magnitude beyond today's best.","keywords":["asymmetric top molecules","electron electric dipole moment","parity doublet","K-doubling","engineered clock transitions","optical trapping","laser-cooled polyatomic molecules","relativistic coupled-cluster calculations"],"falsifier":"Measure the spin-rotation constants (notably $\\epsilon_{aa}$) of RaNH2 by high-resolution rotational or microwave-optical double-resonance spectroscopy and compare with the FS-CCSD value of 496 MHz; a deviation similar to the known factor-of-two discrepancies in CaNH2 and SrNH2 would invalidate the specific RaNH2 operating points and the $1\\times10^{-31}$ e·cm projection, while agreement would support them. A cheaper near-term check is to verify the predicted Sr$^{14}$NH2 clock transition at $E=145.35$ V/cm, $B=28.26$ G and its roughly 65 s coherence time under the stated field-noise budget.","tokens_in":43529,"feed_emoji":"⚛️","tokens_out":9036,"duration_ms":76471,"temperature":0.7,"pith_summary":"This paper argues that asymmetric top molecules of the M–NH2 family (M = Ca, Sr, Ba, Ra) offer a route to next-generation electron electric dipole moment (eEDM) searches that is not available to diatomic or linear polyatomic molecules. The reason is a symmetry-protected parity doublet, the rotational K-doublet, that lives in the vibronic ground state and therefore is not limited by vibrational radiative lifetime; nuclear-spin statistics make the $K_a=1$ ortho manifold metastable on timescales far beyond any experimental one. Using relativistic coupled-cluster calculations plus an effective Hamiltonian, the authors find many engineered \"clock\" transitions in the $N=1$, $K_a=1$ manifold where differential Stark and Zeeman shifts vanish while electron-spin EDM sensitivity remains large, and they show that magic-angle tuning of an optical trap nulls the differential light shift. For RaNH2 the projected shot-noise sensitivity is $\\delta d_e \\approx 1\\times10^{-31}$ e·cm with $10^3$ molecules, 10 s coherence, and one week of integration, more than an order of magnitude beyond the current best statistical sensitivity. If these numbers hold, laser-coolable asymmetric tops become a practical platform for symmetry-violation searches with long coherence.","feed_headline":"Asymmetric tops could push e-EDM limits tenfold","feed_subtitle":"Ground-state parity doublets plus engineered clock transitions give a projected electron-EDM sensitivity of 1e-31 e·cm.","key_machinery":"The central object is the rotational K-doublet: the near-degenerate opposite-parity pair formed from symmetric-top states $|N,\\pm K,M\\rangle$ when the rotational asymmetry term $\\frac{B-C}{4}$ mixes $\\Delta K=\\pm2$. In these near-prolate molecules the splitting is about 100 MHz for $N=1$, $K_a=1$, small enough to polarize at fields of order $10^2$ V/cm. The $K=1$ doublet is metastable because decay to $K=0$ requires the two hydrogen spins to flip from triplet to singlet, a process mediated only by the tiny off-diagonal hyperfine tensor $T_{ab}$ ($\\sim1$ MHz); the resulting radiative lifetime is estimated at about a million years, leaving blackbody radiation as the dominant loss at room temperature. On top of this long-lived manifold the paper builds engineered clock transitions: operating points $(E,B)$ at which $f_E=\\partial f/\\partial E$ and $f_B=\\partial f/\\partial B$ vanish while $|\\Delta\\Sigma|$ remains large, with the residual second-order curvature and transverse couplings setting the coherence time. Finally, quasi-static trap shifts are handled by the magic angle $\\theta_0=\\arccos(1/\\sqrt{3})\\approx54.7^\\circ$, where the rank-2 polarization tensor component $T^2_0$ vanishes, with an angle-tuned optimum $\\theta^*$ that cancels residual second-order shifts.","core_discovery":"On the paper's own terms, the central discovery is that the intrinsic rotational asymmetry of $C_{2v}$ molecules—specifically the $\\frac{B-C}{4}$ coupling that splits the $\\pm K$ degeneracy into opposite-parity K-doublets—supplies long-lived parity doublets in the electronic and vibrational ground state, and that the dense hyperfine structure of these doublets contains many operating points at which the first-order sensitivity to electric- and magnetic-field noise vanishes while the differential sensitivity to the eEDM interaction, $\\Delta\\Sigma$, stays high. The authors demonstrate this by diagonalizing an effective Hamiltonian for Sr$^{14,15}$NH2 and Ra$^{14,15}$NH2, cataloguing hundreds of field-insensitive transitions with figure of merit $F=|\\Delta\\Sigma|\\sqrt{\\tau_{\\rm EM}/1\\,\\text{s}}\\ge0.25$, and by showing that the residual tensor ac-Stark shift from a 1064-nm optical trap can be cancelled by tilting the trap polarization to a magic angle. Together with a radiative lifetime far exceeding all experimental timescales and a blackbody-limited coherence that reaches $\\sim10^3$ s at cryogenic temperatures, they project a statistical eEDM sensitivity of about $1\\times10^{-31}$ e·cm for RaNH2.","pith_inferences":["The abundance of clock transitions among the four isotopologues suggests the qualitative result—field-insensitive, EDM-sensitive pairs in K-doublets—is robust; the quantitative RaNH2 projection, however, rests on the FS-CCSD spin-rotation tensor, so a measured $\\epsilon_{aa}$ for RaNH2 would either confirm or shift the headline number.","The static-field dressing described here could plausibly be combined with dynamical decoupling pulses; because the two approaches address different noise axes, their joint use might extend effective coherence times beyond the quasi-static field-noise limit estimated in the paper.","The tunable K-doublet gap (smaller for larger $K$, larger for larger $N$) suggests the same molecule family could be adapted to other metrology settings, such as trapped-ion symmetry-violation searches or nuclear-spin-dependent parity-violation experiments, by choosing a manifold that matches an accessible drive frequency.","A direct near-term experimental test would be to measure the Sr$^{14}$NH2 $M(+1/2\\to+3/2)$ clock at $E=145.35$ V/cm, $B=28.26$ G: if the coherence time under the stated field-noise budget does not approach about 65 s, the underlying Hamiltonian parameters would need revision before radium is available."],"forward_implications":["Ground-state parity doublets in asymmetric top molecules remove the vibrational-lifetime ceiling that limits $\\ell$-doublet science states, so EDM measurements become coherence-limited, with $\\tau\\gtrsim10$ s in cryogenic traps.","The $N=1$, $K_a=1$ manifolds of Sr$^{14,15}$NH2 and Ra$^{14,15}$NH2 contain order-100 field-insensitive transitions with $F\\ge0.25$; one Ra$^{14}$NH2 transition reaches $\\tau_{\\rm EM}\\approx262$ s and $F=13.3$ under 10 mV/cm, 100 $\\mu$G field noise.","Magic-angle trap polarization recovers at least a tenth of the trap-free figure of merit for most candidates, and roughly 80% of high-quality transitions survive in a 1-MHz-deep 1064-nm trap with 1% intensity noise.","Using $W_d=110$ GV/cm for RaNH2, the shot-noise formula gives $\\delta d_e\\approx1\\times10^{-31}$ e·cm for $10^3$ molecules, 10 s coherence, and one week of integration, an order of magnitude below the current best statistical sensitivity.","The same engineered-transition framework extends to nuclear magnetic quadrupole and Schiff-moment searches in isotopologues with heavy, spinful nuclei such as $^{173}$Yb or $^{225}$Ra."],"supporting_citations":[{"why":"Supplies the calculated eEDM enhancement factor $W_d=110$ GV/cm for RaNH2 used in the sensitivity projection.","marker":"[30]"},{"why":"Provides the experimental rotational and spin-rotation constants for SrNH2 that anchor the effective Hamiltonian.","marker":"[31]"},{"why":"Introduces engineered field-insensitive molecular clock transitions for symmetry-violation searches, the method this paper extends.","marker":"[24]"},{"why":"Demonstrates engineered clock transitions experimentally in 174YbOH, the operational basis for the finite-field transitions used here.","marker":"[39]"},{"why":"Sets the current best statistical eEDM sensitivity of $2\\times10^{-30}$ e·cm that the projection is compared against.","marker":"[8]"},{"why":"Establishes polyatomic parity doublets as central to EDM measurements with long-lived science states.","marker":"[15]"},{"why":"Establishes asymmetric top molecules as laser-coolable and identifies the K-doublet structure exploited here.","marker":"[29]"},{"why":"Reports the recent demonstration of photon cycling and laser cooling in CaNH2, supporting the experimental viability of the M–NH2 family.","marker":"[32]"},{"why":"Analyzes optical-lattice eEDM prospects and tensor ac-Stark shifts, providing the treatment of trap shifts adapted here.","marker":"[25]"},{"why":"Provides measured blackbody-radiation lifetimes for trapped polyatomic molecules used to estimate thermal decoherence bounds.","marker":"[78]"}],"fun_headline_variants":["Asymmetric tops with magic traps for tenfold better eEDM","Parity doublets in trapped asymmetric tops boost eEDM sensitivity","Asymmetric tops aim to surpass current eEDM limits by tenfold","Trapped asymmetric top molecules for next-gen eEDM probes","Asymmetric tops offer order-of-magnitude eEDM gain"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The load-bearing premise is that the calculated spin-rotation tensor for RaNH2—especially the $\\epsilon_{aa}$ component, which FS-CCSD underestimates by about a factor of two for CaNH2 and SrNH2 relative to experiment—is accurate enough to place the radium clock transitions and the projected sensitivity; if it is off by a similar factor, the operating points and the headline $\\delta d_e$ shift, though the availability of useful parity doublets would likely survive.","fun_headline_variants_meta":{"raw":{"variants":["Asymmetric tops with magic traps for tenfold better eEDM","Parity doublets in trapped asymmetric tops boost eEDM sensitivity","Asymmetric tops aim to surpass current eEDM limits by tenfold","Trapped asymmetric top molecules for next-gen eEDM probes","Asymmetric tops offer order-of-magnitude eEDM gain"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000594,"raw_usage":{"total_tokens":2875,"prompt_tokens":1134,"completion_tokens":1741,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":750,"completion_tokens_details":{"reasoning_tokens":1650}},"tokens_in":750,"tokens_out":1741,"duration_ms":11498,"temperature":1.0,"reasoning_tokens":1650,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-11T04:13:15.071672+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"Measure the spin-rotation constants (notably $\\epsilon_{aa}$) of RaNH2 by high-resolution rotational or microwave-optical double-resonance spectroscopy and compare with the FS-CCSD value of 496 MHz; a deviation similar to the known factor-of-two discrepancies in CaNH2 and SrNH2 would invalidate the specific RaNH2 operating points and the $1\\times10^{-31}$ e·cm projection, while agreement would support them. A cheaper near-term check is to verify the predicted Sr$^{14}$NH2 clock transition at $E=145.35$ V/cm, $B=28.26$ G and its roughly 65 s coherence time under the stated field-noise budget.","supporting_citations":[{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Supplies the calculated eEDM enhancement factor $W_d=110$ GV/cm for RaNH2 used in the sensitivity projection."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Provides the experimental rotational and spin-rotation constants for SrNH2 that anchor the effective Hamiltonian."},{"cited_title":"Frenett, Z","cited_arxiv_id":null,"evidence_quote":"Demonstrates engineered clock transitions experimentally in 174YbOH, the operational basis for the finite-field transitions used here."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Establishes asymmetric top molecules as laser-coolable and identifies the K-doublet structure exploited here."},{"cited_title":"Anderegg, N","cited_arxiv_id":null,"evidence_quote":"Reports the recent demonstration of photon cycling and laser cooling in CaNH2, supporting the experimental viability of the M–NH2 family."},{"cited_title":"Timoney, I","cited_arxiv_id":null,"evidence_quote":"Provides measured blackbody-radiation lifetimes for trapped polyatomic molecules used to estimate thermal decoherence bounds."}],"review_version":1}