Tunneling without tunneling: wavefunction reduction in a mesoscopic qubit

Details Tunneling without tunneling: wavefunction reduction in a mesoscopic qubit Tunneling without tunneling: wavefunction reduction in a mesoscopic qubit

2009-09-24

arxiv.org/abs/0909.4343v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures

Scientific paper

The transformation cycle and associated inequality are suggested for the basic demonstration of the wavefunction reduction in a mesoscopic qubit in measurements with quantum-limited detectors. Violation of the inequality would show directly that the qubit state changes in a way dictated by the probabilistic nature of the wavefunction and inconsistent with the dynamics of the Schr\"{o}dinger equation: the qubit tunnels through an infinitely large barrier. Estimates show that the transformation cycle is within the reach of current experiments with superconducting qubits.

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