Professor Artur Ekert FRS: Publications

From quantum-codemaking to quantum code-breaking

(1997)

Quantum Computers and Dissipation

ArXiv quant-ph/9702001 (1997)

Authors:

G Massimo Palma, Kalle-Antti Suominen, Artur K Ekert

Abstract:

We analyse dissipation in quantum computation and its destructive impact on efficiency of quantum algorithms. Using a general model of decoherence, we study the time evolution of a quantum register of arbitrary length coupled with an environment of arbitrary coherence length. We discuss relations between decoherence and computational complexity and show that the quantum factorization algorithm must be modified in order to be regarded as efficient and realistic.

Quantum Computers and Dissipation

(1997)

Authors:

G Massimo Palma, Kalle-Antti Suominen, Artur K Ekert

Quantum algorithms

Institution of Engineering and Technology (IET) 1997 (1997) 2-2

Restoration of quantum states after measurements

Applied Physics B: Lasers and Optics 64:2 (1997) 125-127

Authors:

A Ekert, C Macchiavello

Abstract:

We discuss possibilities of protecting quantum states against disturbances introduced by quantum measurements. We specify conditions under which it is possible to restore an unknown state of a combined quantum system after measurements which were performed on some (but not on all) of its components.

91̽��