Professor Artur Ekert FRS: Publications

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.

Singularities of the mixed state phase (multiple letters)

Physical Review Letters 89:26 (2002)

Authors:

R Bhandari, A Jeeva, E Sjoqvist, M Ericsson, AK Pati, DKL Oi, A Ekert, V Vedral

Singularities of the mixed state phase (multiple letters)

Physical Review Letters 89:26 (2002)

Authors:

R Bhandari, A Jeeva, E Sjoqvist, AK Pati, A Ekert, M Ericsson, DKL Oi, V Vedral

Experimental detection of entanglement via witness operators and local measurements

ArXiv quant-ph/0210134 (2002)

Authors:

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

Abstract:

In this paper we address the problem of detection of entanglement using only few local measurements when some knowledge about the state is given. The idea is based on an optimized decomposition of witness operators into local operators. We discuss two possible ways of optimizing this local decomposition. We present several analytical results and estimates for optimized detection strategies for NPT states of 2x2 and NxM systems, entangled states in 3 qubit systems, and bound entangled states in 3x3 and 2x4 systems.

Experimental detection of entanglement via witness operators and local measurements

(2002)

Authors:

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

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