Engineering quantum decoherence of charge qubit via a nanomechanical resonator

Y. Wang (), Y. Gao and C. Sun ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2004, vol. 40, issue 3, 321-326

Abstract: We propose a theoretical scheme to observe the loss of quantum coherence through the coupling of the superconducting charge qubit system to a nanomechanical resonator (NAMR), which has already been successfully fabricated in experiment and is convenient to manipulate. With a similar form to the usual cavity QED system, this qubit-NAMR composite system with engineered coupling exhibits the collapse and revival phenomenon in a progressive decoherence process. Corresponding to the two components of superposition of the two charge eigenstates, the state of the nanomechanical resonator evolves simultaneously towards two distinct quasi-classical states. Therefore the generalized “which way” detection by the NAMR induces the quantum decoherence of the charge qubit. Copyright Springer-Verlag Berlin/Heidelberg 2004

Date: 2004
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DOI: 10.1140/epjb/e2004-00280-0

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