Repeat-until-success cubic phase gate for universal continuous-variable quantum computation

Marshall, Kevin; Pooser, Raphael; Siopsis, George; Weedbrook, Christian

doi:10.1103/PhysRevA.91.032321

Title: Repeat-until-success cubic phase gate for universal continuous-variable quantum computation

Journal Article · Tue Mar 24 00:00:00 EDT 2015 · Physical Review A - Atomic, Molecular, and Optical Physics

DOI:https://doi.org/10.1103/PhysRevA.91.032321· OSTI ID:1185866

Marshall, Kevin ^[1]; Pooser, Raphael ^[2]; Siopsis, George ^[3]; Weedbrook, Christian ^[4]

Univ. of Toronto, ON (Canada). Dept. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Information Science Group; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
QKD Corp., Toronto, ON (Canada)

We report that to achieve universal quantum computation using continuous variables, one needs to jump out of the set of Gaussian operations and have a non-Gaussian element, such as the cubic phase gate. However, such a gate is currently very difficult to implement in practice. Here we introduce an experimentally viable “repeat-until-success” approach to generating the cubic phase gate, which is achieved using sequential photon subtractions and Gaussian operations. Ultimately, we find that our scheme offers benefits in terms of the expected time until success, as well as the fact that we do not require any complex off-line resource state, although we require a primitive quantum memory.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185866

Alternate ID(s):: OSTI ID: 1179951

Journal Information:: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 91, Issue 3; ISSN 1050-2947

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 49 works

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