Negative result measurements in mesoscopic systems

Abstract

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.

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

References in corpus (1)

• Continuous quantum measurement of a double dot

Cited by in corpus (4)

• Single qubit measurements with an asymmetric single-electron transistor
• Qubit measurements with a double-dot detector
• The Leggett-Garg inequality in electron interferometers
• Global stability criterion for a quantum feedback control process on a single qubit and exponential stability in case of perfect detection efficiency