Quantum state engineering assisted by entanglement

Details Quantum state engineering assisted by entanglement Quantum state engineering assisted by entanglement

2002-11-20

arxiv.org/abs/quant-ph/0211127v1

Phys. Rev. A vol 67, 042104 (2003)

Physics

Quantum Physics

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Scientific paper

10.1103/PhysRevA.67.042104

We suggest a general scheme for quantum state engineering based on conditional measurements carried out on entangled twin-beam of radiation. Realistic detection schemes such as {\sc on/off} photodetection, homodyne detection and joint measurement of two-mode quadratures are analyzed in details. Imperfections of the apparatuses, such as nonunit quantum efficiency and finite resolution, are taken into account. We show that conditional {\sc on/off} photodetection provides a reliable scheme to verify nonclassicality, whereas conditional homodyning represents a tunable and robust source of squeezed light. We also describe optical teleportation as a conditional measurement, and evaluate the degrading effects of finite amount of entanglement, decoherence due to losses, and nonunit quantum efficiency.

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