A dissipation gradient plus detuning ramp selects a resonant pinned density front in 2D driven-dissipative Bose-Hubbard lattice simulations, producing tunable depinning, pattern locking, and chaos.
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A regularized variational method for counterdiabatic driving is developed for the quantum Rabi model, yielding two CD terms coupling the atom to field quadratures and enabling Floquet implementation across strong to deep-strong regimes.
A Krylov-space approach provides exact expressions for the Lieb-Robinson velocity and quantum speed limit in the single-excitation subspace of inhomogeneous spin ensembles, revealing strong dependence on the resonance frequency distribution.
Variational perturbation theory extends the radius of convergence for steady-state calculations in open quantum systems and replaces pseudo-inverse computations with LU decomposition or Krylov recycling.
Two-photon parametric amplification in a superconducting circuit exponentially strengthens cavity-qubit coupling, enabling faster charging and decoherence-resistant energy storage in a quantum battery.
A modified input-output approach with an added low-Q cavity channel models giant-atom electromagnetic scattering beyond the dipole approximation, explaining generic Fano-type spectra and extracting dissipation and coupling parameters.
Pseudomode elimination works for nonlinearly intercoupled modes in cQED whenever the eliminated sector's self-energy on the retained subsystem is rational, enabling finite damped auxiliaries independent of retained nonlinearities.
Empirically learned dynamical decoupling sequences reduce average error rates in dynamic quantum circuits by a factor of three and enable nontrivial process fidelity for quantum Fourier transforms on up to 20 qubits.
A single shared Π-filter integrated in the feedline uses engineered microwave interference to suppress environmental admittance and deliver Purcell-limited qubit relaxation times above 1 ms across roughly 1.5 GHz while preserving readout and reset modes.
Driven non-Hermitian systems show an informational Mpemba effect where more mixed initial states reach unit-purity steady states faster than less mixed ones through collective dissipation.
A self-consistent input-output approach eliminates cavity modes in non-adiabatic CQED to yield an effective two-level atom model with non-Markovian decoherence captured by an effective Lindblad equation having positive and negative rates.
The concatenated dual displacement code suppresses Gaussian displacement error variance by up to 50% under infinite squeezing while correcting lattice-crossing events in CV quantum error correction.
A Schwinger-Keldysh path integral formalism is developed for input-output theory, enabling computation of full output field coherence functions for nonlinear quantum systems.
Cross-Kerr coupling in the two-photon bosonic regime of a SQUID-coupled phase qubit never vanishes due to potential asymmetry and coupler nonlinearity, with explicit limits on the number of coherent states needed for the approximation.
A contextual cavity QED analogue of the Stern-Gerlach experiment is proposed in which continuous phase-sensitive detection of the cavity field drives spontaneous dressed-state polarization and persistent coherent-state superpositions.
Numerical simulations predict that tensile or unstrained germanium heterostructures yield spin splittings over 100 times larger than compressive cases, enabling GHz Andreev spin qubits with 100 ns all-electric gates.
A driven-dissipative model for qudit-resonator systems is used to derive expressions for quantum/tunneling capacitances and Sisyphus/Hermes resistances that change when the two subsystems influence each other dynamically.
Perfect displacement of superconducting resonators is achieved via fast-forward scaling of drive amplitude or detuning, enabling high-speed R_ZZ gates in Kerr-cat qubits.
In the topological regime of a parametrically modulated spin-1/2 chain, time-averaged magnetization shows no frequency dispersion and spatial correlations are absent or suppressed near resonance, with the topological-to-trivial transition set by modulation frequency.
A tantalum thin-film superconducting device produces on-demand microwave single photons with clear antibunching behavior.
citing papers explorer
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Dissipation-Selected Resonant Fronts in a Driven-Dissipative Bose-Hubbard Lattice
A dissipation gradient plus detuning ramp selects a resonant pinned density front in 2D driven-dissipative Bose-Hubbard lattice simulations, producing tunable depinning, pattern locking, and chaos.
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Regularized Counterdiabatic Driving for the Quantum Rabi Model
A regularized variational method for counterdiabatic driving is developed for the quantum Rabi model, yielding two CD terms coupling the atom to field quadratures and enabling Floquet implementation across strong to deep-strong regimes.
-
Quantum information spreading in inhomogeneous spin ensembles
A Krylov-space approach provides exact expressions for the Lieb-Robinson velocity and quantum speed limit in the single-excitation subspace of inhomogeneous spin ensembles, revealing strong dependence on the resonance frequency distribution.
-
Variational Perturbation Theory in Open Quantum Systems for Efficient Steady State Computation
Variational perturbation theory extends the radius of convergence for steady-state calculations in open quantum systems and replaces pseudo-inverse computations with LU decomposition or Krylov recycling.
-
Quantum battery optimized by parametric amplification
Two-photon parametric amplification in a superconducting circuit exponentially strengthens cavity-qubit coupling, enabling faster charging and decoherence-resistant energy storage in a quantum battery.
-
An input-output approach for giant atom scatterings beyond the dipole approximation
A modified input-output approach with an added low-Q cavity channel models giant-atom electromagnetic scattering beyond the dipole approximation, explaining generic Fano-type spectra and extracting dissipation and coupling parameters.
-
An extensive theory of nonlinearly intercoupled pseudomodes for noise model reduction in circuit QED
Pseudomode elimination works for nonlinearly intercoupled modes in cQED whenever the eliminated sector's self-energy on the retained subsystem is rational, enabling finite damped auxiliaries independent of retained nonlinearities.
-
Learning error suppression strategies for dynamic quantum circuits
Empirically learned dynamical decoupling sequences reduce average error rates in dynamic quantum circuits by a factor of three and enable nontrivial process fidelity for quantum Fourier transforms on up to 20 qubits.
-
Engineered broadband Purcell protection using a shared $\Pi$-filter for multiplexed superconducting qubits
A single shared Π-filter integrated in the feedline uses engineered microwave interference to suppress environmental admittance and deliver Purcell-limited qubit relaxation times above 1 ms across roughly 1.5 GHz while preserving readout and reset modes.
-
Informational Mpemba Effect for Fast State Purification in Non-Hermitian System
Driven non-Hermitian systems show an informational Mpemba effect where more mixed initial states reach unit-purity steady states faster than less mixed ones through collective dissipation.
-
Cavity elimination in cavity-QED: a self-consistent input-output approach
A self-consistent input-output approach eliminates cavity modes in non-adiabatic CQED to yield an effective two-level atom model with non-Markovian decoherence captured by an effective Lindblad equation having positive and negative rates.
-
A Concatenated Dual Displacement Code for Continuous-Variable Quantum Error Correction
The concatenated dual displacement code suppresses Gaussian displacement error variance by up to 50% under infinite squeezing while correcting lattice-crossing events in CV quantum error correction.
-
Path Integral Approach to Input-Output Theory
A Schwinger-Keldysh path integral formalism is developed for input-output theory, enabling computation of full output field coherence functions for nonlinear quantum systems.
-
Two-photon coupling via Josephson element II: Interaction dressing, cross-Kerr coupling, and limits of low-energy bosonic model
Cross-Kerr coupling in the two-photon bosonic regime of a SQUID-coupled phase qubit never vanishes due to potential asymmetry and coupler nonlinearity, with explicit limits on the number of coherent states needed for the approximation.
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Operating a contextual Stern-Gerlach apparatus
A contextual cavity QED analogue of the Stern-Gerlach experiment is proposed in which continuous phase-sensitive detection of the cavity field drives spontaneous dressed-state polarization and persistent coherent-state superpositions.
-
Strain engineering of Andreev spin qubits in Germanium
Numerical simulations predict that tensile or unstrained germanium heterostructures yield spin splittings over 100 times larger than compressive cases, enabling GHz Andreev spin qubits with 100 ns all-electric gates.
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Reflections on Quantum Reflectometry: Quantum and Tunneling capacitances as well as Sisyphus and Hermes resistances
A driven-dissipative model for qudit-resonator systems is used to derive expressions for quantum/tunneling capacitances and Sisyphus/Hermes resistances that change when the two subsystems influence each other dynamically.
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Perfect displacement of a superconducting resonator via fast-forward scaling and its application to high-speed $R_{ZZ}$ gates in Kerr-cat qubits
Perfect displacement of superconducting resonators is achieved via fast-forward scaling of drive amplitude or detuning, enabling high-speed R_ZZ gates in Kerr-cat qubits.
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Anomalous parametric resonance in a spin-1/2 chain: dynamical effects of nontrivial topology
In the topological regime of a parametrically modulated spin-1/2 chain, time-averaged magnetization shows no frequency dispersion and spatial correlations are absent or suppressed near resonance, with the topological-to-trivial transition set by modulation frequency.
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On-Demand Microwave Single-Photon Source Based on Tantalum Thin Film
A tantalum thin-film superconducting device produces on-demand microwave single photons with clear antibunching behavior.
- Quantum Origin of Diffraction from Bright and Dark States