A finite-frequency fluctuation-response inequality bounds the measured lock-in response-to-noise matrix by the output-field quantum Fisher information rate for Markovian open quantum systems.
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Postselected sBs stabilization plus repeated finite-energy measurements yield single-mode GKP SPAM error below 10^{-3} (two orders better than prior art) while remaining compatible with autonomous QEC.
Programmable nonlinear bosonic circuits can deterministically produce phased-comb states that serve as a scalable bosonic quantum error-correcting code with near-optimal performance against boson loss.
Feedback in a parametric resonator enables deep subthreshold squeezing or cooling of fluctuations near Hopf and saddle-node bifurcations.
A parity-violating Kerr parametric oscillator exhibits doubly-degenerate levels via antiunitary symmetry, showing spontaneous symmetry breaking is possible without parity protection.
Path-integral derivation of non-perturbative switching rates for bistable open quantum systems obeying hidden time-reversal symmetry, with direct application to bit-flip rates in dissipative cat qubits.
Proposes multi-component bridge states outside cat code space for syndrome extraction in teleportation-based cat code QEC when nonlinear interactions are limiting.
Time-optimal control produces Fock and Schrödinger cat states in light-matter systems at unit fidelity with lower energetic cost and noise robustness than adiabatic methods.
citing papers explorer
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Finite-frequency fluctuation-response bounds for open quantum systems
A finite-frequency fluctuation-response inequality bounds the measured lock-in response-to-noise matrix by the output-field quantum Fisher information rate for Markovian open quantum systems.
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Quantum error correction of a grid-state qubit with state preparation and measurement errors below $10^{-3}$
Postselected sBs stabilization plus repeated finite-energy measurements yield single-mode GKP SPAM error below 10^{-3} (two orders better than prior art) while remaining compatible with autonomous QEC.
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Deterministic generation of grid states with programmable nonlinear bosonic circuits
Programmable nonlinear bosonic circuits can deterministically produce phased-comb states that serve as a scalable bosonic quantum error-correcting code with near-optimal performance against boson loss.
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Deep squeezing or cooling the fluctuations of a parametric resonator using feedback
Feedback in a parametric resonator enables deep subthreshold squeezing or cooling of fluctuations near Hopf and saddle-node bifurcations.
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Degeneracy beyond the parity-symmetry protection in one-dimensional spinless models: The parity-violating Kerr parametric oscillator
A parity-violating Kerr parametric oscillator exhibits doubly-degenerate levels via antiunitary symmetry, showing spontaneous symmetry breaking is possible without parity protection.
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Non-perturbative switching rates in bistable open quantum systems: from driven Kerr oscillators to dissipative cat qubits
Path-integral derivation of non-perturbative switching rates for bistable open quantum systems obeying hidden time-reversal symmetry, with direct application to bit-flip rates in dissipative cat qubits.
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Use of Faulty States in Cat-Code Error Correction
Proposes multi-component bridge states outside cat code space for syndrome extraction in teleportation-based cat code QEC when nonlinear interactions are limiting.
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Time optimal quantum state engineering
Time-optimal control produces Fock and Schrödinger cat states in light-matter systems at unit fidelity with lower energetic cost and noise robustness than adiabatic methods.