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Proceedings Paper

Noise and measurement backaction in superconducting circuits: qubits as spectrometers of quantum noise
Author(s): Robert J. Schoelkopf; A. A. Clerk; S. M. Girvin; Konrad W. Lehnert; M. H. Devoret
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Paper Abstract

Electrical engineers and physicists are naturally very interested in noise in circuits, amplifiers and detectors. With the advent of quantum computation and other high frequency electronics operating at low temperatures, we have entered a regime where quantum noise and quantum-limited detectors are important. Here we describe the general concept of a two-level system as a quantum spectrum analyzer and apply it to a simple superconducting qubit, the Cooper-pair box. We then discuss the coupling of a Cooper-pair box to its electromagnetic environment, whose noise leads to a finite polarization and excited-state lifetime of the qubit. Finally, we describe a theoretical technique for treating a qubit coupled to a measurement system, which allows one to calculate the full quantum noise of the measurement device. We present results for such a calculation for the case of a normal SET.

Paper Details

Date Published: 8 May 2003
PDF: 21 pages
Proc. SPIE 5115, Noise and Information in Nanoelectronics, Sensors, and Standards, (8 May 2003); doi: 10.1117/12.488922
Show Author Affiliations
Robert J. Schoelkopf, Yale Univ. (United States)
A. A. Clerk, Yale Univ. (United States)
S. M. Girvin, Yale Univ. (United States)
Konrad W. Lehnert, Yale Univ. (United States)
M. H. Devoret, Yale Univ. (United States)


Published in SPIE Proceedings Vol. 5115:
Noise and Information in Nanoelectronics, Sensors, and Standards
Laszlo B. Kish; Frederick Green; Giuseppe Iannaccone; John R. Vig, Editor(s)

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