Professor Artur Ekert FRS: Publications

Decoherence and Quantum Error Correction

Chapter in The Physics of Quantum Information, Springer Nature (2000) 221-259

Authors:

AK Ekert, KA Suominen, MB Plenio, PL Knight, C Macchiavello, GM Palma, A Steane, SF Huelga

Decoherence and quantum error correction in frequency standards

(2000) 337-345

Authors:

C Macchiavello, SF Huelga, JI Cirac, AK Ekert, MB Plenio

Abstract:

The precision of frequency measurements performed on trapped ions in the presence of decoherence is analysed. In particular, standard Ramsey spectroscopy on uncorrelated ions and optimal measurements on maximally entangled states are proved to lead to the same resolution, while the best precision is achieved using partially entangled preparations. The use of symmetrisation procedures is proposed and it is shown how this allows to overcome even the optimal precision achievable when both the initial preparation and the final measurement are optimized.

Quantum Cryptography

Chapter in The Physics of Quantum Information, Springer Nature (2000) 15-48

Authors:

A Ekert, N Gisin, B Huttner, H Inamori, H Weinfurter

Quantum entanglement and secrecy

CHALLENGES FOR THE 21ST CENTURY (2000) 339-350

The physics of quantum information

Springer Verlag, 2000

Authors:

Dirk Bouwmeester, Artur K Ekert, Anton Zeilinger

Abstract:

78. D. Boschi, S. Branca. F. De Martini, L. Hardy, and S. Popescu, Phys. Rev. Lett. 80, 1121 (1998). 79. L. Vaidman, Phys. Rev. A 49, 1473 (1994). 80. SL Braunstein and HJ Kimble, Phys. Rev. Lett. 80, 869 (1998). 81.

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