All-optical generation of states for “Encoding a qubit in an oscillator”
- 24 September 2010
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 35 (19), 3261-3263
- https://doi.org/10.1364/ol.35.003261
Abstract
Most quantum computation schemes propose encoding qubits in two-level systems. Others exploit the use of an infinite-dimensional system. In “Encoding a qubit in an oscillator” [Phys. Rev. A 64, 012310 (2001)], Gottesman, Kitaev, and Preskill (GKP) combined these approaches when they proposed a fault-tolerant quantum computation scheme in which a qubit is encoded in the continuous position and momentum degrees of freedom of an oscillator. One advantage of this scheme is that it can be performed by use of relatively simple linear optical devices, squeezing, and homodyne detection. However, we lack a practical method to prepare the initial GKP states. Here we propose the generation of an approximate GKP state by using superpositions of optical coherent states (sometimes called “Schrödinger cat states”), squeezing, linear optical devices, and homodyne detection.Keywords
Funding Information
- Instituto Nacional de Ciência e Tecnologia de Informação Quântica (INCT-IQ)
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (PNPD/CAPES)
- Fundação Cearense de Apoio ao Desenvolvi mento Científico e Tecnológico (FUNCAP)
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