Parity-Swap State Comparison Amplifier for Schrödinger Cat States

Abstract

We propose a postselecting parity-swap amplifier for Schrödinger cat states that does not require the amplified state to be known a priori. The device is based on a previously-implemented state comparison amplifier for coherent states. It consumes only Gaussian resource states, which provides an advantage over some cat state amplifiers. It requires simple Geiger-mode photodetectors and works with high fidelity and approximately twofold gain.

References in corpus (11)

• Fault-tolerant linear optical quantum computing with small-amplitude coherent states
• Generation of Optical Coherent State Superpositions by Number-Resolved Photon Subtraction from Squeezed Vacuum
• Optical continuous-variable qubit
• Generating "squeezed" superpositions of coherent states using photon addition and subtraction
• Violation of Bell's inequality using classical measurements and non-linear local operations
• Amplification of realistic cat-like states by homodyne heralding
• Large amplitude coherent state superposition generated by a time-separated two-photon subtraction from a continuous wave squeezed vacuum
• Conditional generation of an arbitrary superposition of coherent states
• Generating a Schrödinger-cat-like state via a coherent superposition of photonic operations
• Experimental Implementation of a Quantum Optical State Comparison Amplifier
• Testing Bell inequalities with photon-subtracted Gaussian states