期刊
PHYSICAL REVIEW A
卷 97, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.97.042124
关键词
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资金
- EU FEDER, from the EU FP7 project PAPETS [GA 323901]
- EU FEDER from the JTF project NQuN [ID 60478]
- EU FP7 Marie Curie Fellowship [GA 628912]
- Samsung Scholarship
- Air Force Office of Scientific Research (AFOSR) MURI on Optimal Quantum Measurements and State Verification
- Air Force Office of Scientific Research (AFOSR) MURI [FA9550-14-1-0052]
- AFOSR Presidential Early Career Award
- Army Research office MURI biological transduction program
- Office of Naval Research [N00014-13-1-0316]
- EPSRC [EP/K004077/1]
- Army Research Laboratory Center for Distributed Quantum Information
- Fundacao para a Ciencia e a Tecnologia (Portugal) through programmes PTDC/POPH/POCH
- Fundacao para a Ciencia e a Tecnologia (Portugal), through project IT/QuSim [UID/EEA/50008/2013]
- Fundacao para a Ciencia e a Tecnologia (Portugal) through project IT/QuNet [UID/EEA/50008/2013]
- Fundacao para a Ciencia e a Tecnologia (Portugal) through ProQuNet [UID/EEA/50008/2013]
- EPSRC [EP/K004077/1] Funding Source: UKRI
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 protocolwill 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, andmany-body physics.
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