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Volumn 301, Issue 5630, 2003, Pages 203-206

Detection of quantum noise from an electrically driven two-level system

Author keywords

[No Author keywords available]

Indexed keywords

OSCILLATIONS; SUPERCONDUCTING MATERIALS; TUNNEL JUNCTIONS;

EID: 0037815136     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1084175     Document Type: Article
Times cited : (196)

References (32)
  • 2
    • 0004203616 scopus 로고
    • Addison-Wesley, Reading, MA
    • R. P. Feynman, Lectures on Physics, vol. 3 (Addison-Wesley, Reading, MA, 1965).
    • (1965) Lectures on Physics , vol.3
    • Feynman, R.P.1
  • 6
  • 8
    • 79956044918 scopus 로고    scopus 로고
    • 8T is not required if the TLS is decoupled from phonons such as in spin systems. See, e.g., C. Durkan, M. E. Welland, Appl. Phys. Lett. 80, 458 (2002).
    • (2002) Appl. Phys. Lett. , vol.80 , pp. 458
    • Durkan, C.1    Welland, M.E.2
  • 9
    • 0037788084 scopus 로고    scopus 로고
    • note
    • There have been few measurements of the high-frequency symmetrized current noise (27, 28)
  • 11
    • 0038464852 scopus 로고    scopus 로고
    • e-Print available, and references therein
    • R. J. Schoelkopf et al., e-Print available at http:// xxx.lanl.gov/abs/cond-mat/0210247, and references therein.
    • Schoelkopf, R.J.1
  • 12
    • 0038125787 scopus 로고    scopus 로고
    • note
    • Usually the bandwidth is in the kHz to MHz range, due to the long cabling between the low temperature device and room temperature equipment and additional filtering against room temperature noise.
  • 13
    • 0038464849 scopus 로고    scopus 로고
    • note
    • SIS detectors are sensitive up to frequencies ∼2Δ/h. For aluminum junctions, which are used in this work, this is around 100 GHz. Niobium junctions are used in astronomy and go up to THz.
  • 15
    • 0037788072 scopus 로고    scopus 로고
    • note
    • The description of the sample is detailed in the supporting online material (SOM) Text.
  • 17
    • 0037788076 scopus 로고    scopus 로고
    • note
    • SIS < 2δ, only the first term is nonzero.
  • 20
    • 0038125785 scopus 로고    scopus 로고
    • note
    • SiS>2Δ, the SIS detector is sensitive to (ω > 0. In this case, the PAT is a small correction on a large background current and difficult to measure.
  • 21
    • 0037788074 scopus 로고    scopus 로고
    • note
    • 1(f) is negligible in our range of parameters. This has been checked numerically.
  • 23
    • 0037788073 scopus 로고    scopus 로고
    • note
    • p is the probe junction resistance, we deduce Γ = 2 GHz.
  • 24
    • 0037788069 scopus 로고    scopus 로고
    • note
    • The strong asymmetry in the JQP peak regarding emission and absorption was observed by Y. Nakamura et al. (30). It is also consistent with recent theoretical predictions (31, 32).
  • 25
    • 0037788071 scopus 로고    scopus 로고
    • note
    • p. It is estimated from similarly fabricated junctions with a 20% uncertainty.
  • 28
    • 0002633794 scopus 로고
    • H. Grabert, M. H. Devoret, Eds. Plenum, New York
    • G. L. Ingold, Yu. V. Nazarov, in Single-Charge Tunneling, H. Grabert, M. H. Devoret, Eds. (Plenum, New York, 1992), pp. 21-106.
    • (1992) Single-Charge Tunneling , pp. 21-106
    • Ingold, G.L.1    Nazarov, Yu.V.2
  • 30
    • 0038125782 scopus 로고    scopus 로고
    • e-Print available
    • G. Johansson, e-Print available at http://xxx.lanl.gov/ abs/cond-mat/0210539.
    • Johansson, G.1
  • 32
    • 0038464844 scopus 로고    scopus 로고
    • note
    • We thank Y. Nakamura, K. Harmans, P. Hadley, Y. Nazarov, H. Mooij, D. Bagrets, and Y. Blanter for discussions. We acknowledge the technical assistance of R. Schouten, B. van der Enden, and M. van Oossanen. Supported by the Dutch Organisation for Fundamental Research (FOM), and U.S. Army Research Office (grant DAAD19-02-1-0700).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.