Production of superpositions of coherent states in traveling optical fields with inefficient photon detection

Details Production of superpositions of coherent states in traveling optical fields with inefficient photon detection Production of superpositions of coherent states in traveling optical fields with inefficient photon detection

2004-10-04

arxiv.org/abs/quant-ph/0410022v2

Phys. Rev. A 72, 013801 (2005)

Physics

Quantum Physics

13 pages, 9 figures, to be published in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.72.013801

We develop an all-optical scheme to generate superpositions of macroscopically distinguishable coherent states in traveling optical fields. It non-deterministically distills coherent state superpositions (CSSs) with large amplitudes out of CSSs with small amplitudes using inefficient photon detection. The small CSSs required to produce CSSs with larger amplitudes are extremely well approximated by squeezed single photons. We discuss some remarkable features of this scheme: it effectively purifies mixed initial states emitted from inefficient single photon sources and boosts negativity of Wigner functions of quantum states.

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