Professor Artur Ekert FRS: Publications

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

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

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

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.

On direct detection of entanglement properties of unknown states

(2003) 7-12

Authors:

P Horodecki, AK Ekert, CM Alves, DKL Oi, LC Kwek

Abstract:

The recent development of methods for detecting entanglement of unknown quantum state is described. In particular, the fundamental limitations due to the linearity of quantum mechanics axe discussed. Then both qualitative and quantitative methods of entanglement detection are shortly presented.

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