Work

Optimizing Performance of Quantum Operations with Non-Markovian Decoherence: The Tortoise or the Hare?

Year: 2024

Type: article

Abstract: The interaction between a quantum system and its environment limits our ability to control it and perform quantum operations on it. We present an efficient method to find optimal controls for quantum systems coupled to non-Markovian environments, by using the process tensor to compute the gradient of an objective function. We consider state transfer for a driven two-level system coupled to a bosonic environment, and characterize performance in terms of speed and fidelity. This allows us to determine the best achievable fidelity as a function of process duration. We show there can be a trade-off between speed and fidelity, and that slower processes can have higher fidelity by exploiting non-Markovian effects.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.132.060401

Authors: Eoin P. Butler, Gerald E. Fux, Carlos Ortega-Taberner, Brendon W. Lovett, Jonathan Keeling, Paul R. Eastham

Institutions: Trinity College Dublin, The Abdus Salam International Centre for Theoretical Physics (ICTP), University of St Andrews

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funders: Science Foundation Ireland, Irish Research Council, Engineering and Physical Sciences Research Council

Awards: EPSRC Centre for Doctoral Training in Condensed Matter Physics: Renewal of the CM-DTC, G1909520295, Heat transfer and dissipation in quantum devices: exploiting strong-coupling to structured baths for enhanced performance, Understanding and engineering dissipation in nanoscale quantum devices