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  1. link.aps.org

    Here we present a feedback algorithm applied to a quantum system, which is capable of stabilizing the collective state of an ensemble from its maximum entropy state to the limit of single quantum fluctuations. ... Optimal Purification of a Spin Ensemble by Quantum-Algorithmic Feedback Daniel M. Jackson, Urs Haeusler, Leon Zaporski, Jonathan H ...
  2. ieeexplore.ieee.org

    Optimal purification of a spin ensemble by quantum-algorithmic feedback ... IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. ... We present a coherent quantum feedback algorithm to purify a mesoscopic spin ensemble at the ultimate level of a single spin. Applying it ...
  3. journals.aps.org

    nuclear-spin distributions of the ensemble. Going beyond this, we propose a simple extension of our algorithm to allow the proliferation of quantum coherences of the ensemble that are otherwise destroyed by optical pumping. II. RESULTS A. Three-step feedback algorithm The generality of our feedback algorithm allows it to be
  4. ieeexplore.ieee.org

    Optimal purification of a spin ensemble by quantum-algorithmic feedback Abstract: We present a coherent quantum feedback algorithm to purify a mesoscopic spin ensemble at the ultimate level of a single spin. Applying it to a quantum dot narrowed nuclear-spin fluctuations by two orders of magnitude. ... Technical Interests; Need Help? US ...
  5. Purifying a high-temperature ensemble of quantum particles towards a known state is a key requirement to exploit quantum many-body effects. An alternative to passive cooling, which brings a system to its ground state, is based on feedback to stabilise the system actively around a target state. This alternative, if realised, offers additional control capabilities for the design of quantum ...
    Author:Daniel M. Jackson, Urs Haeusler, Leon Zaporski, Jonathan H. Bodey, Noah Shofer, Edmund Clarke, Maxim...Published:2021
  6. researchgate.net

    Quantum-algorithmic feedback. (a) Pulsed control (red shading) of a central spin (blue), homogeneously coupled to a spin ensemble (red), can purify the state of the system, removing entropy via ...
  7. researchgate.net

    We implement this on ~50,000 nuclei in a semiconductor quantum dot, and show that the nuclear-spin fluctuations are reduced 83-fold down to 10 spin macrostates. While our algorithm can purify a ...
  8. repository.cam.ac.uk

    Here we present a quantum feedback algorithm capable of stabilising the collective state of an ensemble from an infinite-temperature state to the limit of single quanta. We implement this on ~50,000 nuclei in a semiconductor quantum dot, and show that the nuclear-spin fluctuations are reduced 83-fold down to 10 spin macrostates.
  9. nationalepitaxyfacility.co.uk

    This alternative, if realized, offers additional control capabilities for the design of quantum states. Here we present a feedback algorithm applied to a quantum system, which is capable of stabilizing the collective state of an ensemble from its maximum entropy state to the limit of single quantum fluctuations.

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