Remote preparation of a single-mode photonic qubit by measuring field quadrature noise
S. A. Babichev, B. Brezger, A. I. Lvovsky
Abstract
An electromagnetic field quadrature measurement, performed on one of the modes of the nonlocal single-photon state a|1,0>-b|0,1>, collapses it into a superposition of the single-photon and vacuum states in the other mode. We use this effect to implement remote preparation of arbitrary single-mode photonic qubits conditioned on observation of a preselected quadrature value. The quantum efficiency of the prepared qubit can be higher than that of the initial single photon.
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