Coherent control via weak measurements in P 31 single-atom electron and nuclear spin qubits

Muhonen, JT; Dehollain, JP; Laucht, A; Simmons, S; Kalra, R; Hudson, FE; Dzurak, AS; Morello, A; Jamieson, DN; McCallum, JC; Itoh, KM

Coherent control via weak measurements in P 31 single-atom electron and nuclear spin qubits

Muhonen, JT Dehollain, JP

Laucht, A Simmons, S Kalra, R Hudson, FE Dzurak, AS Morello, A Jamieson, DN McCallum, JC Itoh, KM

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Publication Type:: Journal Article
Citation:: Physical Review B, 2018, 98 (15)
Issue Date:: 2018-10-05

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Field	Value	Language
dc.contributor.author	Muhonen, JT	en_US
dc.contributor.author	Dehollain, JP https://orcid.org/0000-0002-0425-4345	en_US
dc.contributor.author	Laucht, A	en_US
dc.contributor.author	Simmons, S	en_US
dc.contributor.author	Kalra, R	en_US
dc.contributor.author	Hudson, FE	en_US
dc.contributor.author	Dzurak, AS	en_US
dc.contributor.author	Morello, A	en_US
dc.contributor.author	Jamieson, DN	en_US
dc.contributor.author	McCallum, JC	en_US
dc.contributor.author	Itoh, KM	en_US
dc.date.issued	2018-10-05	en_US
dc.identifier.citation	Physical Review B, 2018, 98 (15)	en_US
dc.identifier.issn	2469-9950	en_US
dc.identifier.uri	http://hdl.handle.net/10453/131529
dc.description.abstract	© 2018 American Physical Society. 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 strength and perturbation of the nuclear state as a physical meter to extract the tunnel rates between the P31 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.	en_US
dc.relation.ispartof	Physical Review B	en_US
dc.relation.isbasedon	10.1103/PhysRevB.98.155201	en_US
dc.title	Coherent control via weak measurements in P 31 single-atom electron and nuclear spin qubits	en_US
dc.type	Journal Article
utslib.citation.volume	15	en_US
utslib.citation.volume	98	en_US
utslib.for	0206 Quantum Physics	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - QSI - Centre for Quantum Software and Information
utslib.copyright.status	open_access
pubs.issue	15	en_US
pubs.publication-status	Published	en_US
pubs.volume	98	en_US

Abstract:

© 2018 American Physical Society. 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 strength and perturbation of the nuclear state as a physical meter to extract the tunnel rates between the P31 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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http://hdl.handle.net/10453/131529