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One-Shot Quantum Measurement Using a Hysteretic dc SQUID
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© 2003 American Physical Society (APS). http://www.aps.org/
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en
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238304/1-4
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Physical Review Letters, Volume 90, Issue 23
Abstract
We propose a single shot quantum measurement to determine the state of a Josephson charge quantum bit (qubit). The qubit is a Cooper pair box and the measuring device is a two junction superconducting quantum interference device (dc SQUID). This coupled system exhibits a close analogy with a Rydberg atom in a high Q cavity, except that in the present device we benefit from the additional feature of escape from the supercurrent state by macroscopic quantum tunneling, which provides the final readout. We test the feasibility of our idea against realistic experimental circuit parameters and by analyzing the phase fluctuations of the qubit.
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Buisson, O. & Balestro, F. & Pekola, Jukka & Hekking, F. W. J. 2003. One-Shot Quantum Measurement Using a Hysteretic dc SQUID. Physical Review Letters. Volume 90, Issue 23. 238304/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.90.238304.