| Zugriffsnummer | 25504 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Entanglement in a solid state spin ensemble |
| Autor(in); Institution |
Simmons, S.; Oxford University, Department of Materials, Oxford, UK
Brown, Richard M.; Oxford University, Department of Materials, Oxford, UK
Riemann, Helge; Leibniz-Institut für Kristallzüchtung, Berlin, GERMANY
Abrosimov, Nikolai V.; Leibniz-Institut für Kristallzüchtung, Berlin, GERMANY
Becker, Peter; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Pohl, Hans-Joachim; VITCON Projectconsult GmbH, Jena, GERMANY
Thewalt, Mike L. W.; Simon Fraser University, Department of Physics, Burnaby, CANADA
Itoh, Kohei M.; Keio University, School of Fundamental Science and Technology, Yokohama, JAPAN
Morton, John J. L.; Oxford University, Department of Materials, Oxford, UK; CAESR, Clarendon Laboratory, Oxford University, Oxford, UK
|
| Quelle/Jahr | Nature: 470 (2011), No.7332, 69 - 72 |
| ISSN | 0028-0836 |
| DOI | |
| URL | |
| Verlag | London: Nature Publishing Group |
| Zusammenfassung | Entanglement is the quintessential quantum phenomenon and a necessary ingredient in most emerging quantum technologies, including quantum repeaters, quantum information processing (QIP) and the strongest forms of quantum cryptography. Spin ensembles, such as those in liquid state nuclear magnetic resonance, have been powerful in the development of quantum control methods, however, these demonstrations contained 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/low temperature electron spin resonance (3.4 T, 2.9 K) with hyperpolarisation of the 31P 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% compared with the ideal state at this field and temperature. The entanglement operation was performed simultaneously, with high fidelity, to 1010 spin pairs, and represents an essential requirement of a silicon-based quantum information processor. |
