Low-control and robust quantum refrigerator and applications with electronic spins in diamond
At a Glance
Section titled âAt a Glanceâ| Metadata | Details |
|---|---|
| Publication Date | 2018-04-25 |
| Journal | Physical review. A/Physical review, A |
| Authors | Majid Mohammady, Hyeongrak Choi, Matthew E. Trusheim, Abolfazl Bayat, Dirk Englund |
| Institutions | Instituto Politécnico de Lisboa, University of Electronic Science and Technology of China |
| Citations | 15 |
Abstract
Section titled âAbstractâWe propose a general protocol for low-control refrigeration and thermometry\nof thermal qubits, which can be implemented using electronic spins in diamond.\nThe refrigeration is implemented by a probe, consisting of a network of\ninteracting spins. The protocol involves two operations: (i) free evolution of\nthe probe; and (ii) a swap gate between one spin in the probe and the thermal\nqubit we wish to cool. We show that if the initial state of the probe falls\nwithin a suitable range, and the free evolution of the probe is both unital and\nconserves the excitation in the $z$-direction, then the cooling protocol will\nalways succeed, with an efficiency that depends on the rate of spin dephasing\nand the swap gate fidelity. Furthermore, measuring the probe after it has\ncooled many qubits provides an estimate of their temperature. We provide a\nspecific example where the probe is a Heisenberg spin chain, and suggest a\nphysical implementation using electronic spins in diamond. Here the probe is\nconstituted of nitrogen vacancy (NV) centers, while the thermal qubits are dark\nspins. By using a novel pulse sequence, a chain of NV centers can be made to\nevolve according to a Heisenberg Hamiltonian. This proposal allows for a range\nof applications, such as NV-based nuclear magnetic resonance of photosensitive\nmolecules kept in a dark spot on a sample, and it opens up possibilities for\nthe study of quantum thermodynamics, environment-assisted sensing, and\nmany-body physics.\n
Tech Support
Section titled âTech SupportâOriginal Source
Section titled âOriginal SourceâReferences
Section titled âReferencesâ- 2002 - Quantum Mechanics and Its Emergent Macrophysics [Crossref]