| Issue |
Europhys. Lett.
Volume 58, Number 4, May 2002
|
|
|---|---|---|
| Page(s) | 562 - 568 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00432-x | |
| Published online | 01 May 2002 | |
Quantum-efficient charge detection using a single-electron transistor
Department of
Physics and Astronomy, SUNY at Stony Brook - NY, USA
Corresponding author: alec@dwavesys.com
Received:
28
May
2001
Accepted:
4
March
2002
We evaluate the detector nonideality (and energy sensitivity) of a normal-state single-electron transistor in the cotunneling regime in a two-charge-state approximation. The (symmetrized) current-charge cross-correlation vanishes for low frequencies, causing two different definitions of detector nonideality to agree. The result, a universal one-parameter function, shows that near-ideal, quantum-limited measurement of a charge qubit is possible for a wide range of small bias voltages. However, near the threshold voltage for crossover to sequential tunneling, the device becomes strongly nonideal. Interpretations of these findings are discussed.
PACS: 73.23.Hk – Coulomb blockade; single-electron tunneling / 03.67.-a – Quantum information / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion
© EDP Sciences, 2002
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