corner
corner
APS » Journals » Phys. Rev. B » Volume 76 » Issue 10
< Previous Article | Next Article >

Phys. Rev. B 76, 100503(R) (2007) [4 pages]

Coherence of a Josephson phase qubit under partial-collapse measurement

Download: PDF (114 kB) Buy this article Export: BibTeX or EndNote (RIS)

Leonid P. Pryadko1 and Alexander N. Korotkov2
1Department of Physics & Astronomy, University of California, Riverside, California 92521, USA
2Department of Electrical Engineering, University of California, Riverside, California 92521, USA

Received 3 July 2007; published 13 September 2007

We discuss quantum evolution of a decaying state in relation to a recent experiment of Katz et al. Based on exact analytical and numerical solutions of a simple model, we identify a regime where the qubit retains coherence over a finite time interval independently of the rates of the three competing decoherence processes. In this regime, the quantum decay process can be continuously monitored via a “weak” measurement without affecting the qubit coherence.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.100503
DOI:
10.1103/PhysRevB.76.100503
PACS:
74.50.+r, 03.65.Ta, 03.65.Yz, 73.40.Gk
 
< Previous Article | Next Article >