Negative result measurements in mesoscopic systems

Details Negative result measurements in mesoscopic systems Negative result measurements in mesoscopic systems

2003-03-30

arxiv.org/abs/quant-ph/0303177v1

Phys. Lett. A 311 (2003) 292

Physics

Quantum Physics

supersedes quant-ph/9607029, to appear in Phys. Lett. A

Scientific paper

10.1016/S0375-9601(03)00508-5

We investigate measurement of electron transport in quantum dot systems by using single-electron transistor as a noninvasive detector. It is demonstrated that such a detector can operate in the ``negative-result measurement'' regime. In this case the measured current is not distorted, providing that it is a non-coherent one. For a coherent transport, however, the possibility of observing a particular state out of coherent superposition leads to distortion of a measured current even in the ``negative-result measurement'' regime. The corresponding decoherence rate is obtained in the framework of quantum rate equations.

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