Simon J Devitt et al 2007 New J. Phys. 9 384 doi:10.1088/1367-2630/9/10/384
Subspace confinement: how good is your qubit?
Simon J Devitt1,2,4, Sonia G Schirmer1, Daniel K L Oi1,3, Jared H Cole2 and Lloyd C L Hollenberg2
Show affiliationsThe basic operating element of standard quantum computation is the qubit, an isolated two-level system that can be accurately controlled, initialized and measured. However, the majority of proposed physical architectures for quantum computation are built from systems that contain much more complicated Hilbert space structures. Hence, defining a qubit requires the identification of an appropriate controllable two-dimensional sub-system. This prompts the obvious question of how well a qubit, thus defined, is confined to this subspace, and whether we can experimentally quantify the potential leakage into states outside the qubit subspace. We demonstrate how subspace leakage can be characterized using minimal theoretical assumptions by examining the Fourier spectrum of the oscillation experiment.
- PACS
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03.67.Lx Quantum computation architectures and implementations
- Subjects
- Dates
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Issue 10 (October 2007)
Received 14 February 2007
Published 29 October 2007
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Subspace confinement: how good is your qubit?
Simon J Devitt et al 2007 New J. Phys. 9 384
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Optical zeno gate: bounds for fault tolerant operation
Patrick M Leung and Timothy C Ralph 2007 New J. Phys. 9 224
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Nonequilibrium mesoscopic superconductors in a fluctuational regime
N. Chtchelkatchev and V. Vinokur 2009 EPL 88 47001
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Results in Kalb-Ramond field localization and resonances on deformed branes
W. T. Cruz et al 2009 EPL 88 41001
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