@article{f0b62549dd3e4f4d88861ec4cb8a65e9,
title = "A single-atom quantum memory in silicon",
abstract = " Long coherence times and fast gate operations are desirable but often conflicting requirements for physical qubits. This conflict can be resolved by resorting to fast qubits for operations, and by storing their state in a 'quantum memory' while idle. The 31 P donor in silicon comes naturally equipped with a fast qubit (the electron spin) and a long-lived qubit (the 31 P nuclear spin), coexisting in a bound state at cryogenic temperatures. Here, we demonstrate storage and retrieval of quantum information from a single donor electron spin to its host phosphorus nucleus in isotopically enriched 28 Si. The fidelity of the memory process is characterised via both state and process tomography. We report an overall process fidelity %, and memory storage times up to 80 ms. These values are limited by a transient shift of the electron spin resonance frequency following high-power radiofrequency pulses. ",
keywords = "phosphorusin silicon, quantum coherence, quantum memory, silicon quantum computing, single-atom devices, single-spin magnetic resonance, spin qubits",
author = "Solomon Freer and Stephanie Simmons and Arne Laucht and Muhonen, {Juha T.} and Dehollain, {Juan P.} and Rachpon Kalra and Mohiyaddin, {Fahd A.} and Hudson, {Fay E.} and Itoh, {Kohei M.} and McCallum, {Jeffrey C.} and Jamieson, {David N.} and Dzurak, {Andrew S.} and Andrea Morello",
note = "Funding Information: This research was funded by the Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology (project number CE11E0001027), the US Army Research Office (W911NF-13-1-0024) and the Commonwealth Bank of Australia. We acknowledge support from the Australian National Fabrication Facility, and from the laboratory of Prof Robert Elliman at the Australian National University for the ion implantation facilities. The work at Keio has been supported in part by KAKENHI (S) No. 26220602, Core-to-Core Program by JSPS, and Spintronics Research Network of Japan. Publisher Copyright: {\textcopyright} 2017 IOP Publishing Ltd.",
year = "2017",
month = mar,
day = "1",
doi = "10.1088/2058-9565/aa63a4",
language = "English",
volume = "2",
journal = "Quantum Science and Technology",
issn = "2058-9565",
publisher = "Institute of Physics Publishing",
number = "1",
}