3/30/2023 0 Comments Quantum error correction protocols![]() Harnessing dissipative processes by engineering the coupling of a system to an environment or reservoir 29– 37 provides a route for processing quantum information alternative to relying on unitary gate operations 9– 14. In particular we regard trapped-ion systems, which have proven to be an excellent platform for high precision measurements 27, 28, as well as for the realization of quantum error-correcting codes 9, 10. Here we consider whether high-precision measurements can be improved by a self-correction mechanism induced by engineered dissipation. Improving quantum sensing protocols in the presence of noise 15– 21 by applying quantum error-correcting codes 22– 26 represents a young research direction and impressive proof-of-concept realizations have already been demonstrated using nitrogen-vacancy centers 11– 13. The quest to find viable strategies for mitigating errors is thus an essential prerequisite for the development of quantum technologies and has led to techniques for quantum error correction 7– 14. Quantum noise is a major obstacle for devices that take advantage of quantum mechanics, such as quantum computers 1, quantum networks 2, quantum simulators 3, and quantum-enhanced sensors 4– 6. Our work constitutes a stepping stone towards the paradigm of self-correcting quantum information processing. We show that the resulting enhanced coherence time translates into a significantly enhanced precision for quantum measurements. Our dissipative error correction scheme operates in a continuous manner without the need to perform measurements or feedback operations. In our approach, always-on couplings to an engineered environment protect the qubit against spin-flips or phase-flips. Here we present a quantum error correction scheme that harnesses dissipation to stabilize a trapped-ion qubit. Trapped ions are an excellent technological platform for both quantum sensing and quantum error correction. To protect them, the use of quantum error-correcting codes has been proposed. However, quantum sensors lose their sensitivity in the presence of noise. Quantum-enhanced measurements hold the promise to improve high-precision sensing ranging from the definition of time standards to the determination of fundamental constants of nature. ![]()
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