Generation of hybrid entanglement between a single-photon polarization qubit and a coherent state

Abstract

We propose a scheme to generate entanglement between a single-photon qubit in the polarization basis and a coherent state of light. The required resources are a superposition of coherent states, a polarization entangled photon pair, beam splitters, the displacement operation, and four photodetectors. Even when realistic detectors with a limited efficiency are used, an arbitrarily high fidelity can be obtained by adjusting a beam-splitter ratio and the displacement amplitude at the price of reducing the success probability. Our analysis shows that high fidelities may be obtained using on-off detectors with low efficiencies and available resource states under current technology.

6 pages, 5 figures

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• Fault-tolerant quantum computation by hybrid qubits with bosonic cat-code and single photons
• Long-distance entanglement sharing using hybrid states of discrete and continuous variables
• Heralded preparation of polarization entanglement via quantum scissors
• Relationship between the field local quadrature and the quantum discord of a photon-added correlated channel under the influence of scattering and phase fluctuation noise
• Linear optical quantum computing with a hybrid squeezed cat code
• Photonic Hybrid Quantum Computing