Practical purification scheme for decohered coherent-state superpositions via partial homodyne detection

Abstract

We present a simple protocol to purify a coherent-state superposition that has undergone a linear lossy channel. The scheme constitutes only a single beam splitter and a homodyne detector, and thus is experimentally feasible. In practice, a superposition of coherent states is transformed into a classical mixture of coherent states by linear loss, which is usually the dominant decoherence mechanism in optical systems. We also address the possibility of producing a larger amplitude superposition state from decohered states, and show that in most cases the decoherence of the states are amplified along with the amplitude.

8 pages, 10 figures

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• Conditional generation of an arbitrary superposition of coherent states
• Continuous variable entanglement distillation of Non-Gaussian Mixed States
• Measurement-based generation and preservation of cat and grid states within a continuous-variable cluster state
• Loss-resilient photonic entanglement swapping using optical hybrid states
• Quantifying non-Gaussianity of quantum-state correlation
• Quantum Filtering of Optical Coherent States
• Experimental demonstration of a versatile and scalable scheme for iterative generation of non-Gaussian states of light
• Photonic Hybrid State Entanglement Swapping using Cat State Superpositions
• Phenomenological theory of nonergodic phenomena in dipole- and spin-glasses