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Proposal for a destructive controlled phase gate using linear optics.

S U Shringarpure¹, J D Franson²

¹Physics Department, University of Maryland Baltimore County, Baltimore, MD, 21250, USA. saurabh.s@umbc.edu.

Scientific Reports

|November 12, 2021

Summary

This summary is machine-generated.

Researchers present a new, more successful method for creating a controlled-phase gate using linear optics and a single nonlinear sign gate. This advancement is crucial for quantum computing applications, especially those involving postselection.

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Area of Science:

Quantum computing
Linear optics
Quantum gates

Background:

Previous work by Knill, Laflamme, and Milburn demonstrated nonlinear sign gates and controlled-phase gates using linear optics.
Controlled-phase gates are essential for quantum computation but can be challenging to implement efficiently.

Purpose of the Study:

To present an alternative, more efficient implementation of a controlled-phase gate.
To improve the probability of success in quantum gate operations.

Main Methods:

Utilizing a single nonlinear sign gate for a single-rail target qubit.
Employing heralding techniques for ancilla photon generation.

Main Results:

Achieved a significantly higher average probability of success compared to previous methods.
The new implementation destroys the control qubit, which is suitable for specific quantum protocols.

Conclusions:

This simplified implementation offers a more practical approach to realizing controlled-phase gates.
The method enhances the feasibility of certain quantum computing tasks, particularly those involving postselection.