Publikation: Dephasing of a superconducting qubit induced by photon noise
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2005
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Bertet, Patrice
Chiorescu, Irinel
Semba, Kouichi
Harmans, C. J. P. M.
DiVincenzo, David P.
Mooij, J. E.
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Physical Review Letters. 2005, 95, 257002. Available under: doi: 10.1103/PhysRevLett.95.257002
Zusammenfassung
We have studied the dephasing of a superconducting flux-qubit coupled to a DC-SQUID base oscillator. By varying the bias conditions of both circuits we were able to tune their effective coupling strength. This allowed us to measure the effect of such a controllable and well-characterized environment on the qubit coherence. We can quantitatively account for our data with a simple model in which thermal fluctuations of the photon number in the oscillator are the limiting factor. In particular, we observe a strong reduction of the dephasing rate whenever the coupling is tuned to zero. At the optimal point we find a large spin-echo decay time of 4mys.
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BERTET, Patrice, Irinel CHIORESCU, Guido BURKARD, Kouichi SEMBA, C. J. P. M. HARMANS, David P. DIVINCENZO, J. E. MOOIJ, 2005. Dephasing of a superconducting qubit induced by photon noise. In: Physical Review Letters. 2005, 95, 257002. Available under: doi: 10.1103/PhysRevLett.95.257002BibTex
@article{Bertet2005Depha-9524,
year={2005},
doi={10.1103/PhysRevLett.95.257002},
title={Dephasing of a superconducting qubit induced by photon noise},
volume={95},
journal={Physical Review Letters},
author={Bertet, Patrice and Chiorescu, Irinel and Burkard, Guido and Semba, Kouichi and Harmans, C. J. P. M. and DiVincenzo, David P. and Mooij, J. E.},
note={Article Number: 257002}
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<dcterms:abstract xml:lang="eng">We have studied the dephasing of a superconducting flux-qubit coupled to a DC-SQUID base oscillator. By varying the bias conditions of both circuits we were able to tune their effective coupling strength. This allowed us to measure the effect of such a controllable and well-characterized environment on the qubit coherence. We can quantitatively account for our data with a simple model in which thermal fluctuations of the photon number in the oscillator are the limiting factor. In particular, we observe a strong reduction of the dephasing rate whenever the coupling is tuned to zero. At the optimal point we find a large spin-echo decay time of 4mys.</dcterms:abstract>
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