Decoherence and quantum error correction in frequency standards
(2000) 337-345
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
Quantum entanglement and secrecy
CHALLENGES FOR THE 21ST CENTURY (2000) 339-350
The physics of quantum information
Springer Verlag, 2000
Abstract:
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CHALLENGES FOR THE 21ST CENTURY (2000) 351-383