Journal article
Coherent control via weak measurements in P 31 single-atom electron and nuclear spin qubits
JT Muhonen, JP Dehollain, A Laucht, S Simmons, R Kalra, FE Hudson, AS Dzurak, A Morello, DN Jamieson, JC McCallum, KM Itoh
Physical Review B | AMER PHYSICAL SOC | Published : 2018
Abstract
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 P31 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 str..
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Grants
Awarded by Army Research Office
Funding Acknowledgements
We thank A. Korotkov, K. Molmer, R. Ruskov, and D. Ran for insightful comments. This research was funded by the Australian Research Council through Discovery Projects (Grants No. DP150101863 and No. DP180100969) and the Centre of Excellence Quantum Computation and Communication Technology (Grants No. CE11E0001027 and No. CE170100012), the U.S. Army Research Office (Contracts No. W911NF-13-1-0024 and No. W911NF-17-1-0200), and the Commonwealth Bank of Australia. We acknowledge support from the Australian National Fabrication Facility and from the laboratory of Prof. R. Elliman at the Australian National University for the ion implantation facilities. The work at Keio was supported in part by KAKENHI (S) No. 26220602, the Core-to-Core Program by Japan Society for the Promotion of Science, and the Spintronics Research Network of Japan.