Encoding qubits into oscillators with atomic ensembles and squeezed light

Motes, K, Baragiola, B, Gilchrist, A and Menicucci, N 2017, 'Encoding qubits into oscillators with atomic ensembles and squeezed light', Physical Review A, vol. 95, no. 5, 053819, pp. 1-14.

Document type: Journal Article
Collection: Journal Articles

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Title Encoding qubits into oscillators with atomic ensembles and squeezed light
Author(s) Motes, K
Baragiola, B
Gilchrist, A
Menicucci, N
Year 2017
Journal name Physical Review A
Volume number 95
Issue number 5
Article Number 053819
Start page 1
End page 14
Total pages 14
Publisher American Physical Society
Abstract The Gottesman-Kitaev-Preskill (GKP) encoding of a qubit within an oscillator provides a number of advantages when used in a fault-tolerant architecture for quantum computing, most notably that Gaussian operations suffice to implement all single- and two-qubit Clifford gates. The main drawback of the encoding is that the logical states themselves are challenging to produce. Here we present a method for generating optical GKP-encoded qubits by coupling an atomic ensemble to a squeezed state of light. Particular outcomes of a subsequent spin measurement of the ensemble herald successful generation of the resource state in the optical mode. We analyze the method in terms of the resources required (total spin and amount of squeezing) and the probability of success. We propose a physical implementation using a Faraday-based quantum nondemolition interaction.
Subject Quantum Information, Computation and Communication
Quantum Optics
Keyword(s) quantum error-correction
cluster states
DOI - identifier 10.1103/PhysRevA.95.053819
Copyright notice © 2017 American Physical Society
ISSN 2469-9934
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