Frontiers of quantum physics

Research group

Research theme

Sub department

About

Geometric quantum computation with Josephson qubits

Physica C: Superconductivity and its Applications 352:1-4 (2001) 110-112

Authors:

G Falci, R Fazio, G Massimopalma, J Siewert, V Vedral

Abstract:

The quest for large scale integrability and flexibility has stimulated an increasing interest in designing quantum computing devices. A proposal based on small-capacitance Josephson junctions in the charge regime in which quantum gates are implemented by means of adiabatic geometric phases was discussed. The proposed works, are in the charge regime where the qubit is realized by two nearly degenerate charge states of a single electron box.
More details from the publisher
More details

Remote information concentration using a bound entangled state.

Phys Rev Lett 86:2 (2001) 352-355

Authors:

M Murao, V Vedral

Abstract:

Remote information concentration, the reverse process of quantum telecloning, is presented. In this scheme, quantum information originally from a single qubit, but now distributed into three spatially separated qubits, is remotely concentrated back to a single qubit via an initially shared entangled state without performing any global operations. This entangled state is a single unlockable bound entangled state and we analyze its properties.
More details from the publisher
More details

Classical and Quantum Correlations in Thermal Jaynes-Cummings Model

Institute of Electrical and Electronics Engineers (IEEE) (2001) 102-103

Authors:

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

Entangling capacity of global phases and implications for the Deutsch-Jozsa algorithm

Physical Review A. Atomic, Molecular, and Optical Physics 64:6 (2001)

Authors:

H Azuma, S Bose, V Vedral

Abstract:

The generation of entanglement through global phase functions was studied. Necessary and sufficient conditions for the application of global phases to the pure product state to result in entanglement were obtained. The maximum entanglement creation by global phases was considered as well as its corresponding examples.
More details from the publisher
More details

Maximally Entangled Mixed States for Two Qubits

Optics InfoBase Conference Papers (2001)

Authors:

WJ Munro, K Nemoto, DFV James, V Vedral

Abstract:

The recent developments in quantum information have lead to a renewed interest in multi particle quantum mechanics. A two-qubit system displays many of the paradoxical features of quantum mechanics such as superposition and entanglement. Such states can be partially characterized by their degree of impurity and degree of entanglement. We specifically examine the class of states that have the maximum amount of entanglement (EOF) for a given degree of impurity. We show how these states are more entangled than the Werner like state for a given degree of mixture for several measures of entanglement.