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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
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.
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.
