Quantum Physics
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Parity of spin representation determines whether Dicke ladder samples a critical zero, yielding a first-order transition confined to odd-N…
· “A Single Spin Switches the Steady-State Phase of an Open Quantum System”
For stabilizer bases, merging a few local copies cuts copy complexity from diverging to at most three, proving local inter-copy coherence…
· “Power and Limits of Collective Local Measurements in Multicopy State Discrimination”
Nonlocal stabilizer fidelity reduces to distance of Schmidt coefficients from Bell-pair sectors, unifying magic and catalysis.
Measuring k copies together buys a √k speedup, and no adaptive protocol can beat the rate.
· “Tight Lower Bounds for State Tomography with Limited Entanglement”
The paper proves Theorem 1: for an n-qubit system of dimension d=2^n, every density operator with Tr($ρ^{2}$) ≤ 1/(d - a_*) where a_* =…
A common reservoir whose bright direction rotates with frequency quietly drains the protected two-qubit singlet.
· “Spectral Twisting in a Common Bosonic Reservoir: Fragility of Two-Qubit Dark-State Protection”
A single fourth-moment quantifier certifies nonclassicality, with tight qubit bounds and few-copy estimation.
The exact joint density of two random-matrix symmetry classes is a many-body scattering wave, at every size.
· “Exact joint eigenvalue densities of non-Hermitian random matrices are Calogero scattering states”
Even when P=BQP for languages, PromiseBQP escapes PromiseP/poly.
· “Promises should be taken seriously: On relativization with promise problems”
Any continuous uniform construction satisfying entailment, contraposition, and falsity must be the nonnegative part of Q−P.
The detector's spectral shape sets the readout-time exponent, not just the prefactor.
· “Scaling-Enhanced Rapid Readout of a Qubit Ensemble Assisted by High-Frequency Detector Modes”
Closed-form Page curves and monotone entanglement bounds give analytic control over classical hardness of Gaussian boson sampling.
· “Anticoncentration and entanglement in Gaussian boson sampling”
New finite-temperature formalism reveals exponential screening and the precise scaling of extracted energy in a bosonic chain.
· “Thermal screening and critical scaling of quantum energy teleportation in a harmonic chain”
New framework shows how qubits and bits traded for copy complexity when nodes share randomness or not.
· “Distributed Quantum Property Testing with Quantum Carrier Pigeons”
At any rate beyond capacity, both entanglement fidelity and decoding success decay to zero.
· “No information transmission through quantum channels above capacity”
A universal collision bound rules out high-probability solutions, using new matrix-space stability techniques.
· “Impossibility of One-Way One-Round Quantum 4-Coloring via Matrix-Space Stability”
Exact expressions for entropy and heat capacity separate the equilibrium anomaly from transport, with a concrete experimental protocol.
The paper derives a schedule principle for score-based generative models using an imaginary-time counterdiabatic connection in a Score…
No finite strategy can reach its optimal quantum value; an infinite-dimensional one can, resolving a decade-old conjecture.
Closed-form metric M = I + π² Q reveals entanglement graph's role without quantum hardware
Smallest two-outcome Bell scenario separates finite from infinite-dimensional quantum correlations; approach cost is logarithmic.
· “The I3322 quantum value is attained spatially but not in finite dimension”
For finite-copy quantum states, identical samples get different Shapley rankings under different measurement models, with the gap bounded…
· “Shapley Valuation of Finite-Copy Quantum Data Depends on Physical Access”
A unified framework shows that the usual reservoir entropy alone cannot bound precision under feedback; the controller's information…
· “Feedback-Enhanced Quantum Metrology and Clock Precision under Thermodynamic Uncertainty”
Nonabelian anyon superselection sectors violate Haag duality and its equivalent uniqueness of purifications, as proven by operator…
A drift-plus-diffusion matrix condition separates smoothing from irreducibility, unlike in the classical setting.
· “Irreducibility and regularisation properties of Gaussian quantum Markov semigroups”
A new analysis reveals that collision avoidance, not full statistical randomness, is the core requirement for building computationally…
A homological hierarchy encodes Pauli, Clifford, and non-Clifford operations, enabling discovery of constant-depth transversal gates.
· “Computing with qLDPC Codes by Climbing the Chain Map Hierarchy”
Shared dissipation creates low-dissipation channels that sustain boundary time crystals under weak drive and finite detuning.
Cutwidth and tree-cutwidth govern both the compression to MPS or TTN and the sample complexity of tomography, in realisable and agnostic…
A universal curve shows late-time chaotic states protect information as well as any engineered code can.
· “Quantum thermalization achieves optimal approximate quantum error correction”
For sparse data the full nonlinear dynamics reduces to independent scalar flows with explicit convergence times.
A bound state in the continuum grows exponentially under any transverse gain-loss, destroying stationary scattering at arbitrarily small…
Exact transforms yield closed-form bulk correlations and hard-edge densities for ten symmetry classes.
· “Duality between the level statistics of Hermitian and non-Hermitian random matrices”
Proves monotonicity under Pauli noise and links Rényi coherence to a postselected quantum channel capacity.
· “Hierarchy of R\'enyi Coherent Information in Stabilizer Codes”
A continuum of quantum Fisher information matrices completely determines asymptotic conversion rates in the resource theory of asymmetry…
One lithium niobate chip packs the whole sampler; classical simulation would take millions of GPU-years.
· “A Chip-scale Space-time Multiplexed Gaussian Boson Sampling Processor Beyond 10,000 Photons”
A gate in the fifth Clifford hierarchy level is proven not to be generalized semi-Clifford, showing the structure is richer than expected.
Relative to one classical oracle, quantum-state indistinguishability survives while every classical-output hardness collapses.
· “EFI Pairs Without One-Way Puzzles: Oracle Separations from Communication Complexity”
A second-moment criterion separates genuine angular randomization from mere dissipative loss
· “Taking Advantage of Noise in Distributed Random Quantum Circuits”
Using the Autler–Townes effect of cesium Rydberg states, a commercial photomixer transmitter and receiver at 204 GHz are benchmarked…
A fully transparent pipeline from raw NMR signals to validated density matrices, with three integration methods and Jupyter notebook…
· “Computational framework for quantum state tomography of spin ensembles”
Symmetric-tensor stability shows pure-state witnesses gain nothing; pure-state k-local consistency is QMA-complete.
· “PureSuperQMA(exp) = BellPureSymQMA(poly) = QMA via Dimension-Free Bosonic Argmax”
New explicit states push bound entanglement past the n/2 barrier to n minus about sqrt(2n), so M_PPT(n,n)/n tends to 1.
One-time data costs can erase the advantage of a polynomial classical simulation.
· “The cost of simulating classically tractable quantum circuits and dynamics”
Odd-order Forrelation requires k+1 Hadamard layers but not k, settling Shi's oracle question for both query models.
New gradBEA method converges faster and reaches lower energies for fermionic systems using non-local disentangler Hamiltonian
· “Block entropy area based non-local fermionic mode optimization with gradient disentanglers”
A closed-form matrix over F_{q^2} yields an infinite family of optimal quantum error-correcting codes and their associated states.
· “Absolutely Maximally Entangled States of 2q Parties in Every Odd Prime-Power Dimension q”
Fidelity drops exponentially above capacity, settling a key open problem in quantum information theory
· “Strong Converse for Quantum Capacity via a Fully Quantum Blowing-Up Lemma”
Analytic formula covers ballistic to diffusive transport and gives full current statistics.
· “Quantum transport along a tight-binding chain connected to Markovian reservoirs”
A quantum spectral pipeline extracts shape parameters from the Hamiltonian density of states, outperforming classical counting.
· “Learning structural balance of graphs from quantum spectral features”
Which Landau levels compose a charge-neutral state decides whether its boundary conducts, demonstrated in twisted bilayer graphene with…
· “Hilbert-space selected switch of helical edges in an artificial quantum Hall insulator”
A zero-field Förster resonance lets rubidium ancillas entangle ytterbium data qubits without Stark-limited addressing.
· “An exchange-assisted entangling gate between 87Rb and 171Yb Rydberg atoms”
R-linear chain maps between a QLDPC code and a copy of itself define fast, block-addressable surgery, and on the [[90,8,10]] and…
Proof that the Fubini-Study distance, linear entropy sum, and total Quantum Fisher Information are identical for pure states.
A finite wave packet's transmittance is an energy-weighted average of the NEGF transmission, enabling direct current calculation in time…
· “Bridging steady-state and time-domain descriptions of molecular electron transport”
Parametric driving and nonlinear mixing in a superconducting trap create a tunable phononic comb that could be used for compact sensing.
· “Nonlinear dynamics and mechanical frequency combs with a Meissner-levitated micromagnet”
New total Boolean function achieves the largest possible gap up to log factors, settling a long-standing open question.
· “A Near-Quartic Separation Between Certificate Complexity and Quantum Query Complexity”
Two certified bounds — a safe radius and an attack witness — come from measurement shots alone.
· “Certifying Adversarial Robustness of Quantum Classifiers under Known-Readout Query Access”
A simulator-in-the-loop optimizer simultaneously places four high-Q modes on Cs Rydberg frequencies, cutting device length 175×.
· “Quantum-hardware spectral co-design framework for multifrequency Rydberg electrometry”
Effective nonlocal Hamiltonians are only valid when local changes are slow; fast control exposes decoherence from finite-speed mediators.
· “Quantum models of interaction Hamiltonian and their paradoxes”
Engineered local dissipation selectively pumps a passive system into a high-energy scar manifold, yielding near-maximal extractable work…
Micro-transfer printing and SiN waveguides yield >22 mW output and 9.4% efficiency at 795 nm for quantum control systems.
A single parameter tunes pulse width while impulse stays fixed; optimal period maximizes the effect.
A new quantum no-go theorem proves the impossibility of building a fixed unitary that outputs the complex-conjugate of any input qubit.
· “Impossible to conjugate an unknown quantum state via a unitary evolution”
Threshold condition explains why the |11⟩ state suffers sudden death and birth under amplitude damping, while |00⟩ decays monotonically.
· “Birth and Death of Entanglement in Hamiltonian-Driven Quantum Games under Decoherence”
Floquet protocol emulates DQC1 computation to map topogical transition from a single measurement.
By tying noise strength to Trotter step size, a one-dimensional Richardson rule cancels both leading biases with only constant overhead.
· “Joint Mitigation of Algorithmic and Physical Errors in Noisy Hamiltonian Simulation”
Statistical symmetry release turns equivariant quantum models into certifiable, data-driven model selection
· “Statistical Symmetry Release for Equivariant Quantum Learning”
Errors are fixed on-chip by constant-density automata; each logical qubit needs one constant-bandwidth wire.
· “Local decoders for fault-tolerant quantum computation and translation-invariant stabilizer codes”
Classical shadows drive a variational search; a direct verification step delivers a device-independent certificate.
· “Self-guided certification of nonlocality in quantum networks”
Numerical simulation on a three-path interferometer shows interference-based strategies outperform particle-like propagation.
Yang–Baxter commutativity reduces random drives to a single parameter, revealing a first-order switch between rare trajectory classes.
· “Rare-History Transitions in Temporally Random Integrable Quantum Circuits”
A classification shows which intermediate checks preserve final probabilities, and why restarting mid-sequence destroys them.
A tiny imperfection in a microwave field’s polarization selects one direction for density modulations, producing a striped supersolid.
· “Microwave-controlled interactions and stripe formation of static-field-shielded polar molecules”
Network-oriented lower bound from real hardware links optical pair rate to usable entanglement throughput.
Noise and per-degree-of-freedom drift on a real 7.3 km loop become compact models for fidelity and recalibration rates.
Optimizing the unitary orbit of a target Hamiltonian aligns its dynamics with native control resources.
· “Optimizing quantum encodings for analog simulation through dynamical algebra reachability”
Analytic formulas yield exact support, parity, and intra–shell structure; GUP shows deformation shifting weight to higher sectors.
· “From Analytic Structure to Quantum Complexity: Walsh-Pauli Representations of Continuum Operators”
New architecture uses conditional phase shifts in cold atoms to route photonic qubits in a binary tree without exponential gate overhead.
· “Quantum-RAM Implementation Using Multiple Interacting Rydberg-Blockaded EIT Systems”
Photon-photon interactions in Rydberg atoms yield a routing operator that scales logarithmically with address size.
