Signatures of quantum behavior in single-qubit weak measurements

Details Signatures of quantum behavior in single-qubit weak measurements Signatures of quantum behavior in single-qubit weak measurements

2005-05-13

arxiv.org/abs/quant-ph/0505094v3

Phys. Rev. Lett 96, 200404 (2006)

Physics

Quantum Physics

5 pages, new references added, new paragraph on classical noninvasiveness after eq.(4)

Scientific paper

10.1103/PhysRevLett.96.200404

With the recent surge of interest in quantum computation, it has become very important to develop clear experimental tests for ``quantum behavior'' in a system. This issue has been addressed in the past in the form of the inequalities due to Bell and those due to Leggett and Garg. These inequalities concern the results of ideal projective measurements, however, which are experimentally difficult to perform in many proposed qubit designs, especially in many solid state qubit systems. Here, we show that weak continuous measurements, which are often practical to implement experimentally, can yield particularly clear signatures of quantum coherence, both in the measured correlation functions and in the measured power spectrum.

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