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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A SQUID-array Josephson parametric amplifier achieves near-quantum-limited 20 dB gain over ~50 MHz bandwidth, with its complex gain spectra analytically reproduced by adding Fabry-Pérot interference to a quantum input-output model.
A parity-violating Kerr parametric oscillator exhibits doubly-degenerate levels via antiunitary symmetry, showing spontaneous symmetry breaking is possible without parity protection.
citing papers explorer
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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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High-gain and large-bandwidth Josephson parametric amplifier influenced by Fabry-P\'erot interference
A SQUID-array Josephson parametric amplifier achieves near-quantum-limited 20 dB gain over ~50 MHz bandwidth, with its complex gain spectra analytically reproduced by adding Fabry-Pérot interference to a quantum input-output model.
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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.