Mohammady, MH;
Choi, H;
Trusheim, ME;
Bayat, A;
Englund, D;
Omar, Y;
(2018)
Low-control and robust quantum refrigerator and applications with electronic spins in diamond.
Physical Review A
, 97
(4)
, Article 042124. 10.1103/PhysRevA.97.042124.
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Abstract
We propose a general protocol for low-control refrigeration and thermometry of thermal qubits, which can be implemented using electronic spins in diamond. The refrigeration is implemented by a probe, consisting of a network of interacting spins. The protocol involves two operations: (i) free evolution of the probe; and (ii) a swap gate between one spin in the probe and the thermal qubit we wish to cool. We show that if the initial state of the probe falls within a suitable range, and the free evolution of the probe is both unital and conserves the excitation in the z direction, then the cooling protocol will always succeed, with an efficiency that depends on the rate of spin dephasing and the swap-gate fidelity. Furthermore, measuring the probe after it has cooled many qubits provides an estimate of their temperature. We provide a specific example where the probe is a Heisenberg spin chain, and suggest a physical implementation using electronic spins in diamond. Here, the probe is constituted of nitrogen vacancy (NV) centers, while the thermal qubits are dark spins. By using a novel pulse sequence, a chain of NV centers can be made to evolve according to a Heisenberg Hamiltonian. This proposal allows for a range of applications, such as NV-based nuclear magnetic resonance of photosensitive molecules kept in a dark spot on a sample, and it opens up possibilities for the study of quantum thermodynamics, environment-assisted sensing, and many-body physics. Figure Figure Figure Figure Figure Figure
| Type: | Article |
|---|---|
| Title: | Low-control and robust quantum refrigerator and applications with electronic spins in diamond |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevA.97.042124 |
| Publisher version: | https://doi.org/10.1103/PhysRevA.97.042124 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Optics, Physics, Atomic, Molecular & Chemical, Physics, Color-Centers, Single Spins, Resolution, Resonance, Thermodynamics, Coherence, Implantation, Thermometry, Generation |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10053203 |
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