Frontiers of quantum physics

Research group

Research theme

Sub department

About

Thermal concurrence mixing in a one-dimensional Ising model

Physical Review A. Atomic, Molecular, and Optical Physics 64:4 (2001) 423021-423027

Authors:

D Gunlycke, VM Kendon, V Vedral, S Bose

Abstract:

The natural thermal entanglement in an Ising ring in an external magnetic field was studied. The interactions of two qubits via the Ising interaction in a magnetic field orthogonal to the z direction was analyzed. A theorem for the concurrence mixing due to occupation of the ground and the excited state was formulated. The variation of entanglement with the orientation of magnetic field was numerically considered.
More details from the publisher
More details

Foundations and Interpretation of Quantum Mechanics Gennaro Auletta, World Scientific, Singapore, 2000

Progress in Quantum Electronics Elsevier 25:4 (2001) 191
More details from the publisher

Entanglement in a 1D Ising model

Optica Publishing Group (2001) pa16

Authors:

V Kendon, D Gunlycke, V Vedral, S Bose
More details from the publisher

Subsystem purity as an enforcer of entanglement (Phys. Rev. Lett. 87, art. no. 050401, 2001)

PHYSICAL REVIEW LETTERS 87:27 (2001) ARTN 279901

Authors:

S Bose, I Fuentes-Guridi, PL Knight, V Vedral
More details from the publisher

Communication capacity of quantum computation.

Phys Rev Lett 85:25 (2000) 5448-5451

Authors:

S Bose, L Rallan, V Vedral

Abstract:

By considering quantum computation as a communication process, we relate its efficiency to its classical communication capacity. This formalism allows us to derive lower bounds on the complexity of search algorithms in the most general context. It enables us to link the mixedness of a quantum computer to its efficiency and also allows us to derive the critical level of mixedness beyond which there is no quantum advantage in computation.
More details from the publisher
More details