Overcoming experimental limitations in a nonlinear two-qubit gate through postselection
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- 作者：Julián Martínez-Rincón
- 关键词：Quantum control ; Postselection ; Modular ; value amplification ; Cross ; phase modulation ; Measurement ; based quantum computation ; Two ; qubit gate
- 刊名：Quantum Information Processing
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：16
- 期：2
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics;
- 出版者：Springer US
- ISSN：1573-1332
- 卷排序：16
文摘
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.