Quantum coherence and interaction-free measurements

Details Quantum coherence and interaction-free measurements Quantum coherence and interaction-free measurements

2000-07-06

arxiv.org/abs/quant-ph/0007014v1

Phys. Rev. A 62 (2000) 060101(R)

Physics

Quantum Physics

4 pages incl. 2 PostScript figures (.eps), LaTeX using RevTeX, submitted to Phys. Rev. A (Rapid Comm.)

Scientific paper

10.1103/PhysRevA.62.060101

We investigate the extent to which ``interaction-free'' measurements perturb the state of quantum systems. We show that the absence of energy exchange during the measurement is not a sufficient criterion to preserve that state, as the quantum system is subject to measurement dependent decoherence. While it is possible in general to design interaction-free measurement schemes that do preserve that state, the requirement of quantum coherence preservation rapidly leads to a very low efficiency. Our results, which have a simple interpretation in terms of ``which-way'' arguments, open up the way to novel quantum non-demolition techniques.

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