Professor Artur Ekert FRS: Publications

Direct estimation of functionals of density operators by local operations and classical communication

ArXiv quant-ph/0304123 (2003)

Authors:

Carolina Moura Alves, Pawel Horodecki, Daniel KL Oi, LC Kwek, Artur K Ekert

Abstract:

We present a method of determining important properties of a shared bipartite quantum state, within the ``distant labs'' paradigm, using \emph{only} local operations and classical communication (LOCC). We apply this procedure to spectrum estimation of shared states, and locally implementable structural physical approximations to incompletely positive maps. This procedure can also be applied to the estimation of channel capacity and measures of entanglement.

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Direct estimation of functionals of density operators by local operations and classical communication

(2003)

Authors:

Carolina Moura Alves, Pawel Horodecki, Daniel KL Oi, LC Kwek, Artur K Ekert

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Tomographic Quantum Cryptography: Equivalence of Quantum and Classical Key Distillation

(2003)

Authors:

Dagmar Bruss, Matthias Christandl, Artur Ekert, Berthold-Georg Englert, Dagomir Kaszlikowski, Chiara Macchiavello

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Local implementation of witness operators for entanglement detection

Institute of Electrical and Electronics Engineers (IEEE) (2003) 418

Authors:

O Guhne, P Hyllus, D Bruss, M Lewenstein, A Sanpera, A Ekert, C Macchiavello

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Quantum cryptography based on qutrit Bell inequalities

Physical Review A Atomic Molecular and Optical Physics 67:1 (2003) 012310/4

Authors:

D Kaszlikowski, DKL Oi, M Christandl, K Chang, A Ekert, LC Kwek, CH Oh

Abstract:

A crytographic protocol using qutrits which is resistant to a form of symmetric, incoherent attacks is presented. The qutrit Bell inequality provides a sufficient condition for secure communication. The protocol tolerates 33.7% noise, whereas it is 29.2% for E91 or BB84 protocol.

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Professor Artur Ekert FRS

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Direct estimation of functionals of density operators by local operations and classical communication

Authors:

Abstract:

Direct estimation of functionals of density operators by local operations and classical communication

Authors:

Tomographic Quantum Cryptography: Equivalence of Quantum and Classical Key Distillation

Authors:

Local implementation of witness operators for entanglement detection

Authors:

Quantum cryptography based on qutrit Bell inequalities

Authors:

Abstract:

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