Experimental noise filtering by quantum control

By A. Soare, H. Ball, David Hayes, J. Sastrawan, M. C. Jarratt, J. J. McLoughlin, X. Zhen, T. Green, M. Biercuk. Nature Physics, 2014

142 citations recorded by the source corpus.

Quantum technologies are extremely sensitive to environmental disturbance. Control techniques inspired by classical systems engineering allow selective filtering of the noise spectrum, suppressing time-varying noise over defined frequency bands. Extrinsic interference is routinely faced in systems engineering, and a common solution is to rely on a broad class of filtering techniques to afford stability to intrinsically unstable systems or isolate particular signals from a noisy background. Experimentalists leading the development of a new generation of quantum-enabled technologies similarly encounter time-varying noise in realistic laboratory settings. They face substantial challenges in either suppressing such noise for high-fidelity quantum operations1 or controllably exploiting it in quantum-enhanced sensing2,3,4 or system identification tasks 5,6, due to a lack of efficient, validated approaches to understanding and predicting quantum dynamics in the presence of realistic time-varying noise. In this work we use the theory of quantum control engineering7,8 and experiments with trapped 171Yb+ ions to study the dynamics of controlled quantum systems. Our results provide the first experimental validation of generalized filter-transfer functions casting arbitrary quantum control operations on qubits as noise spectral filters9,10. We demonstrate the utility of these constructs for directly predicting the evolution of a quantum state in a realistic noisy environment as well as for developing novel robust control and sensing protocols. These experiments provide a significant advance in our understanding of the physics underlying controlled quantum dynamics, and unlock new capabilities for the emerging field of quantum systems engineering.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/863a1a6d768bf90c484dfea1f662e29f528f1192

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Methodology of Resonant Equiangular Composite Quantum Gates (2016, methodology): “The set of achievable quantum response functions is changed by introducing elements such as additional (possibly continuous) control parameters, disturbances, coupled spins [10,59,60], or open systems [20,61].”