Practical creation and detection of polarization Bell states using parametric down-conversion

Details Practical creation and detection of polarization Bell states using parametric down-conversion Practical creation and detection of polarization Bell states using parametric down-conversion

2002-04-05

arxiv.org/abs/quant-ph/0204034v2

Physics

Quantum Physics

13 pages, 4 figures, to be published in Solvay conference proceedings, fixed figure captions

Scientific paper

The generation and detection of maximally-entangled two-particle states, `Bell states,' are crucial tasks in many quantum information protocols such as cryptography and teleportation. Unfortunately, they require strong inter-particle interactions lacking in optics. For this reason, it has not previously been possible to perform complete Bell state determination in optical systems. In this work, we show how a recently developed quantum interference technique for enhancing optical nonlinearities can make efficient Bell-state measurement possible. We also discuss weaknesses of the scheme including why it cannot be used for unconditional quantum teleportation.

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