Devitt, Simon J. and Schirmer, Sonia G. and Oi, Daniel K.L. and Cole, Jared H. and Hollenberg, Lloyd C.L. (2007) Subspace confinement: how good is your qubit? New Journal of Physics, 9 (Oct). p. 384. ISSN 13672630

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Abstract
The basic operating element of standard quantum computation is the qubit, an isolated twolevel 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 twodimensional subsystem. 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.
Item type:  Article 

ID code:  6213 
Keywords:  qubit, subspace, fourier spectrum, quantum computation, Optics. Light, Physics and Astronomy(all) 
Subjects:  Science > Physics > Optics. Light 
Department:  Faculty of Science > Physics 
Depositing user:  Miss Darcy Spiller 
Date Deposited:  02 Jun 2008 
Last modified:  12 Dec 2015 17:37 
Related URLs:  
URI:  http://strathprints.strath.ac.uk/id/eprint/6213 
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