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21 papers · 2 filters
Decoherence vs entanglement in coined quantum walks
Olivier Maloyer, Viv Kendon
Quantum versions of random walks on the line and cycle show a quadratic improvement in their spreading rate and mixing times respectively. The addition of decoherence to the quantu…
Precision measurement with an optical Josephson junction
H. T. Ng, K. Burnett, J. A. Dunningham
We study a new type of Josephson device, the so-called "optical Josephson junction" as proposed in Phys. Rev. Lett. {\bf 95}, 170402 (2005). Two condensates are optically coupled t…
Entanglement without nonlocality
Dominic Horsman, Vlatko Vedral
We consider the characterization of entanglement from the perspective of a Heisenberg formalism. We derive an original two-party generalized separability criteria, and from this de…
Macroscopic Entanglement and Phase Transitions
Janet Anders, Vlatko Vedral
This paper summarises the results of our research on macroscopic entanglement in spin systems and free Bosonic gases. We explain how entanglement can be observed using entanglement…
Optimal computation with non-unitary quantum walks
Viv Kendon, Olivier Maloyer
Quantum versions of random walks on the line and the cycle show a quadratic improvement over classical random walks in their spreading rates and mixing times respectively. Non-unit…
A random walk approach to quantum algorithms
Viv Kendon
The development of quantum algorithms based on quantum versions of random walks is placed in the context of the emerging field of quantum computing. Constructing a suitable quantum…