Slowing Quantum Decoherence by Squeezing in Phase Space

Abstract

Non-Gaussian states, and specifically the paradigmatic Schrödinger cat state, are well-known to be very sensitive to losses. When propagating through damping channels, these states quickly loose their non-classical features and the associated negative oscillations of their Wigner function. However, by squeezing the superposition states, the decoherence process can be qualitatively changed and substantially slowed down. Here, as a first example, we experimentally observe the reduced decoherence of squeezed optical coherent-state superpositions through a lossy channel. To quantify the robustness of states, we introduce a combination of a decaying value and a rate-of-decay of the Wigner function negativity. This work, which uses squeezing as an ancillary Gaussian resource, opens new possibilities to protect and manipulate quantum superpositions in phase space.

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• High-fidelity bosonic quantum state transfer using imperfect transducers and interference
• Experimental preparation and manipulation of squeezed cat states via an all-optical in-line squeezer
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• Generation of multi-photon Fock states at telecommunication wavelength using picosecond pulsed light
• Harnessing two-photon dissipation for enhanced quantum measurement and control
• Quantum memories for squeezed and coherent superpositions in a driven-dissipative nonlinear oscillator
• Nanomechanical State Amplifier Based on Optical Inverted Pendulum
• Locally optimal control of continuous variable entanglement
• Quantum squeezing amplification with a weak Kerr nonlinear oscillator
• Second-order correlation and squeezing of photons in cavities with ultrastrong magnon-photon interactions
• Deterministic generation of nonclassical mechanical states in cavity optomechanics via reinforcement learning
• Error suppression in multicomponent cat codes with photon subtraction and teleamplification
• Catability as a metric for evaluating superposed coherent states
• Generalized Number-Phase Lattice Encoding of a Bosonic Mode for Quantum Error Correction
• CHSH Bell Tests For Optical Hybrid Entanglement
• Adapting coherent-state superpositions in noisy channels
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• Non-Gaussian state teleportation with a nonlinear feedforward
• Fast and robust cat state preparation utilizing higher order nonlinearities in Rydberg ensembles
• Cavity cooling using ultrafast electrons
• Circuit-level fault tolerance of cat codes