期刊
PHYSICAL REVIEW B
卷 98, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.155201
关键词
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资金
- Australian Research Council [DP150101863, DP180100969]
- Centre of Excellence Quantum Computation and Communication Technology [CE11E0001027, CE170100012]
- U.S. Army Research Office [W911NF-13-1-0024, W911NF-17-1-0200]
- Commonwealth Bank of Australia
- Australian National Fabrication Facility
- KAKENHI [26220602]
- Core-to-Core Program by Japan Society for the Promotion of Science
- Spintronics Research Network of Japan
The understanding of weak measurements and interaction-free measurements has greatly expanded the conceptual and experimental toolbox to explore the quantum world. Here we demonstrate single-shot variable-strength weak measurements of the electron and nuclear spin states of a P-31 single-atom donor in silicon. We first show how the partial collapse of the nuclear spin due to measurement can be used to coherently rotate the spin to a desired pure state. We explicitly demonstrate that phase coherence is preserved with high fidelity throughout multiple sequential single-shot weak measurements and that the partial state collapse can be reversed. Second, we use the relation between measurement strength and perturbation of the nuclear state as a physical meter to extract the tunnel rates between the P-31 donor and a nearby electron reservoir from data conditioned on observing no tunneling events. Our experiments open avenues to measurement-based state preparation, steering and feedback protocols for spin systems in the solid state, and highlight the fundamental connection between information gain and state modification in quantum mechanics.
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