C Hines et al 2007 J. Phys. A: Math. Theor. 40 F609 doi:10.1088/1751-8113/40/27/F05
Readout of solid-state charge qubits using a single-electron pump
FREE ARTICLEC Hines1, K Jacobs2,3 and J B Wang1
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A major difficulty in realizing a solid-state quantum computer is the reliable measurement of the states of the quantum registers. In this paper, we propose an efficient readout scheme making use of the resonant tunnelling of a ballistic electron produced by a single-electron pump. We treat the measurement interaction in detail by modelling the full spatial configuration and show that for pumped electrons with suitably chosen energy the transmission coefficient is very sensitive to the qubit state. We further show that by using a short sequence of pumping events, coupled with a simple feedback control procedure, the qubit can be measured with a high accuracy.
- PACS
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03.67.Lx Quantum computation architectures and implementations
- MSC
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81P68 Quantum computation and quantum cryptography (See also 68Q05, 94A60)
- Subjects
- Dates
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Issue 27 (6 July 2007)
Received 5 February 2007, in final form 25 May 2007
Published 20 June 2007
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Readout of solid-state charge qubits using a single-electron pump
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