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Related Experiment Videos

Practical experimental certification of computational quantum gates using a twirling procedure.

Osama Moussa¹, Marcus P da Silva, Colm A Ryan

¹Institute for Quantum Computing, University of Waterloo, Ontario, Canada. omoussa@iqc.ca

Physical Review Letters

|September 26, 2012

Summary

Estimating quantum computer fidelity is crucial. Researchers adapted quantum memory experiments to efficiently measure the average fidelity of quantum computation processes, enabling practical characterization of current quantum devices.

Related Experiment Videos

Area of Science:

Quantum Computing
Quantum Information Science
Experimental Physics

Background:

Assessing the fidelity of quantum computing implementations is essential due to the technical challenges in building large-scale quantum computers.
Traditional quantum process tomography demands exponential resources, rendering it impractical for even small quantum devices.

Purpose of the Study:

To develop a practical and efficient method for estimating the average fidelity of quantum computation processes on current quantum devices.
To adapt existing twirling experiments for characterizing quantum memories to assess quantum computation fidelity.

Main Methods:

Adapted twirling experiments, previously used for quantum memory fidelity, to estimate average fidelity of quantum computation processes.
Applied the adapted method to characterize the fidelity of implementing unitaries within the Clifford group.
Demonstrated state-of-the-art coherent control for a 3-qubit code encoding operation using nuclear spins in a solid-state system.

Main Results:

The adapted twirling experiments provide an efficient and practical approach to estimate average fidelity for quantum computation processes.
Achieved high-fidelity coherent control, implementing a 3-qubit code encoding operation with only a 1% average fidelity degradation (excluding preparation and measurement errors).

Conclusions:

Twirling experiments offer a scalable and efficient solution for fidelity estimation in contemporary quantum computing hardware.
The demonstrated high-fidelity control highlights advancements in manipulating quantum systems for practical quantum computation.