Phys. Rev. Lett. 96, 060402 (2006) [4 pages]Qubit Assisted Probing of Coherence between Mesoscopic States of an ApparatusReceived 6 August 2004; revised 26 September 2005; published 15 February 2006 I present a general scheme through which the evidence of a superposition involving distinct states of a mesoscopic system can be probed. The scheme relies on a single qubit being coupled to a mesoscopic harmonic oscillator in such a way that it can be used to both prepare and probe a superposition of states of the oscillator. Two potentially realizable implementations, one with a single flux qubit coupled to an LC circuit, and the other with a single ion-trap qubit coupled to the collective motion of several ions, are proposed. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.060402
DOI:
10.1103/PhysRevLett.96.060402
PACS:
03.65.Ta, 03.65.Ud, 03.67.−a, 32.80.Lg
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