In a two-parameter family of quadratic bosonic Hamiltonians from a modified bosonic SSH model, topological phase transitions occur along lines of Krein collisions and topological classification holds in both stable and unstable regimes via symplectic Berry phase and index theory.
Quantum information with continuous variables,
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Proposes first receiver-centric blockwise coding with sequential CUSUM detection for covert bosonic channels, deriving minimum segment lengths under per-block covertness using linear-vs-quadratic asymmetry for general-dyne receivers.
No-go theorem shows ancilla energy freedom does not raise max QFI beyond the signal-only optimum in Gaussian passive-unitary estimation under signal-energy constraint.
Fractional OAM charge ℓ=1.5 induces an optimal 67.5° GKP lattice rotation that reduces error rate 23.9× with <0.2% loss in Fisher information and yields 41% higher metrological capacity.
Engineered two-photon loss mitigates single-photon loss in TPD-Kerr systems by converting oscillatory decay to monotonic and extending metrological windows over an order of magnitude via non-Gaussian cat states.
Reservoir engineering modifies the susceptibility of a weakly driven two-level medium to control transmission modulation and angular selectivity in electromagnetically induced gratings.
Continuous-variable photonic platform with 20,000-mode cluster state simulates advection transport equation, achieving relative errors of 0.8% and 0.92% on first- and second-order moments via homodyne readout.
Microscopic phase contributions from crystal edges produce large threshold variations in nominally identical linear OPOs, traced via SHG and threshold measurements on three devices.
In finite-depth random linear optical circuits, entanglement grows at most diffusively and robust circuit complexity scales similarly, with depth bounds ensuring near-maximal subsystem entanglement and closeness to Haar unitaries.
The paper provides an expository review of squeezed states of light and related phenomena using the Wigner phase-space formalism and groups such as Lorentz and symplectic.
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Entanglement and circuit complexity in finite-depth random linear optical networks
In finite-depth random linear optical circuits, entanglement grows at most diffusively and robust circuit complexity scales similarly, with depth bounds ensuring near-maximal subsystem entanglement and closeness to Haar unitaries.