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Related Experiment Video

Updated: Jun 5, 2026

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

Published on: April 1, 2020

Experimental implementation of the optimal linear-optical controlled phase gate.

Karel Lemr¹, A Cernoch, J Soubusta

¹Joint Laboratory of Optics of Palacký University, Institute of Physics of Academy of Sciences of the Czech Republic, 779 07 Olomouc, Czech Republic.

Physical Review Letters

|January 15, 2011

Summary

This summary is machine-generated.

Researchers experimentally created optimal linear-optical controlled phase gates for any phase shift. This flexible quantum gate achieves maximum success probabilities using bulk optics and polarization encoding.

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Area of Science:

Quantum Information Science
Quantum Optics
Linear Optics

Background:

Controlled phase gates are fundamental quantum computing primitives.
Previous implementations were limited in phase flexibility or optimality.
Linear-optical quantum computing offers a promising platform for quantum information processing.

Purpose of the Study:

To experimentally realize optimal linear-optical controlled phase gates for arbitrary phase shifts.
To demonstrate the flexibility and optimality of the proposed quantum gate scheme.
To investigate the relationship between phase shift and success probability.

Main Methods:

Utilizing bulk optical elements for quantum gate implementation.
Employing polarization encoding of qubit states.
Leveraging postselection with vacuum ancillas for optimal success probabilities.

Main Results:

Successful experimental realization of controlled phase gates for arbitrary phase shifts.
Demonstration of maximum achievable success probabilities within the postselected linear-optical framework.
Observation that optimum success probability is not monotonically dependent on the phase shift.

Conclusions:

The presented scheme offers a flexible and optimal method for implementing controlled phase gates using linear optics.
This work advances the capabilities of linear-optical quantum computing.
Further exploration of the non-monotonic behavior of success probability could yield new insights.