Destructive Controlled-Phase Gate Using Linear Optics

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2103.03711.pdf (633.95 KB)

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https://arxiv.org/abs/2103.03711

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http://hdl.handle.net/11603/21261

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https://orcid.org/0000-0003-0576-9145

Date

2021-03-05

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journal articles preprints
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Citation of Original Publication

Shringarpure, S.U.; Franson, J.D.; Destructive Controlled-Phase Gate Using Linear Optics; Quantum Physics (2021); https://arxiv.org/abs/2103.03711

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Abstract

Knill, Laflamme, and Milburn [Nature 409, 46 (2001)] showed that linear optics techniques could be used to implement a nonlinear sign gate. They also showed that two of their nonlinear sign gates could be combined to implement a controlled-phase gate, which has a number of practical applications. Here we describe an alternative implementation of a controlled-phase gate that only requires the use of a single nonlinear sign gate. This gives a much higher average probability of success when the required ancilla photons are generated using heralding techniques. This implementation of a controlled-phase gate destroys the control qubit, which is acceptable in a number of applications where the control qubit would have been destroyed in any event, such as in a postselection process.