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Quantum Information Processing

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01-02-2017

Overcoming experimental limitations in a nonlinear two-qubit gate through postselection

Author: Julián Martínez-Rincón

Published in: Quantum Information Processing | Issue 2/2017

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Abstract

We introduce a modular-value two-qubit gate and explore its advantages in experimentally limited situations. The gate is defined such that the final state of a qubit is fully controlled by a pre- and postselection procedure in an ancillary qubit given an (imperfect or technically limited) intermediate conditional qubit–qubit interaction. As an example of the gate and its benefit, we make the connection to a postselected cross-phase modulation scenario when a undesired absorption is present. Probabilistic amplification of a small cross phase while mitigating relative absorption is possible, and a complementary behavior between phase and amplitude emerges.

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Title: Overcoming experimental limitations in a nonlinear two-qubit gate through postselection
Author: Julián Martínez-Rincón
Publication date: 01-02-2017
Publisher: Springer US
Published in: Quantum Information Processing / Issue 2/2017
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI: https://doi.org/10.1007/s11128-016-1485-7

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