Coherent feedback control of a single qubit in diamond
Name
Cappellaro_Coherent feedback.pdf
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3.62 MB
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Adobe PDF
Checksum (MD5)
c0506d3df0cdbcd753e6b6b7eaa45852
Author(s)
Hirose, Masashi
Cappellaro, Paola
Date Issued
April 2016
Journal
Nature
Publisher
Nature Publishing Group
Citation
Hirose, Masashi, and Paola Cappellaro. “Coherent Feedback Control of a Single Qubit in Diamond.” Nature 532.7597 (2016): 77–80.
Version
Original manuscript
Abstract
Engineering desired operations on qubits subjected to the deleterious effects of their environment is a critical task in quantum information processing, quantum simulation and sensing. The most common approach is to rely on open-loop quantum control techniques, including optimal control algorithms, based on analytical or numerical solutions, Lyapunov design and Hamiltonian engineering. An alternative strategy, inspired by the success of classical control, is feedback control. Because of the complications introduced by quantum measurement, closed-loop control is less pervasive in the quantum settings and, with exceptions, its experimental implementations have been mainly limited to quantum optics experiments. Here we implement a feedback control algorithm with a solid-state spin qubit system associated with the Nitrogen Vacancy (NV) centre in diamond, using coherent feedback [9] to overcome limitations of measurement-based feedback, and show that it can protect the qubit against intrinsic dephasing noise for milliseconds.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/nature17404
