Entanglement in a solid-state spin ensemble

Stephanie Simmons, Richard M. Brown, Helge Riemann, Nikolai V. Abrosimov, Peter Becker, Hans Joachim Pohl, Mike L W Thewalt, Kohei M Itoh, John J L Morton

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

Entanglement is the quintessential quantum phenomenon. It is a necessary ingredient in most emerging quantum technologies, including quantum repeaters, quantum information processing and the strongest forms of quantum cryptography. Spin ensembles, such as those used in liquid-state nuclear magnetic resonance, have been important for the development of quantum control methods. However, these demonstrations contain no entanglement and ultimately constitute classical simulations of quantum algorithms. Here we report the on-demand generation of entanglement between an ensemble of electron and nuclear spins in isotopically engineered, phosphorus-doped silicon. We combined high-field (3.4T), low-temperature (2.9K) electron spin resonance with hyperpolarization of the 31 P nuclear spin to obtain an initial state of sufficient purity to create a non-classical, inseparable state. The state was verified using density matrix tomography based on geometric phase gates, and had a fidelity of 98% relative to the ideal state at this field and temperature. The entanglement operation was performed simultaneously, with high fidelity, on 10 10 spin pairs; this fulfils one of the essential requirements for a silicon-based quantum information processor.

Original languageEnglish
Pages (from-to)69-72
Number of pages4
JournalNature
Volume470
Issue number7332
DOIs
Publication statusPublished - 2011 Feb 3

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Silicon
Temperature
Electron Spin Resonance Spectroscopy
Automatic Data Processing
Phosphorus
Magnetic Resonance Spectroscopy
Tomography
Electrons
Technology

ASJC Scopus subject areas

  • General

Cite this

Simmons, S., Brown, R. M., Riemann, H., Abrosimov, N. V., Becker, P., Pohl, H. J., ... Morton, J. J. L. (2011). Entanglement in a solid-state spin ensemble. Nature, 470(7332), 69-72. https://doi.org/10.1038/nature09696

Entanglement in a solid-state spin ensemble. / Simmons, Stephanie; Brown, Richard M.; Riemann, Helge; Abrosimov, Nikolai V.; Becker, Peter; Pohl, Hans Joachim; Thewalt, Mike L W; Itoh, Kohei M; Morton, John J L.

In: Nature, Vol. 470, No. 7332, 03.02.2011, p. 69-72.

Research output: Contribution to journalArticle

Simmons, S, Brown, RM, Riemann, H, Abrosimov, NV, Becker, P, Pohl, HJ, Thewalt, MLW, Itoh, KM & Morton, JJL 2011, 'Entanglement in a solid-state spin ensemble', Nature, vol. 470, no. 7332, pp. 69-72. https://doi.org/10.1038/nature09696
Simmons S, Brown RM, Riemann H, Abrosimov NV, Becker P, Pohl HJ et al. Entanglement in a solid-state spin ensemble. Nature. 2011 Feb 3;470(7332):69-72. https://doi.org/10.1038/nature09696
Simmons, Stephanie ; Brown, Richard M. ; Riemann, Helge ; Abrosimov, Nikolai V. ; Becker, Peter ; Pohl, Hans Joachim ; Thewalt, Mike L W ; Itoh, Kohei M ; Morton, John J L. / Entanglement in a solid-state spin ensemble. In: Nature. 2011 ; Vol. 470, No. 7332. pp. 69-72.
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