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- Centre National de la Recherche ScientifiqueFR256 papers
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10 papers · 2 filters
Preparing high purity initial states for nuclear magnetic resonance quantum computing
M. S. Anwar, D. Blazina, H. Carteret +5
Here we demonstrate how para-hydrogen can be used to prepare a two-spin system in an almost pure state which is suitable for implementing nuclear magnetic resonance (NMR) quantum c…
Optimal measurements for relative quantum information
Stephen D. Bartlett, Terry Rudolph, Robert W. Spekkens
We provide optimal measurement schemes for estimating relative parameters of the quantum state of a pair of spin systems. We prove that the optimal measurements are joint measureme…
On improving single photon sources via linear optics and photodetection
Dominic W. Berry, Stefan Scheel, Barry C. Sanders +1
In practice, single photons are generated as a mixture of vacuum with a single photon with weights 1-p and p, respectively; here we are concerned with increasing p by directing mul…
Engineering squeezed states in high-Q cavities
N. G. de Almeida, R. M. Serra, C. J. Villas-Boas +1
While it has been possible to build fields in high-Q cavities with a high degree of squeezing for some years, the engineering of arbitrary squeezed states in these cavities has onl…
Entanglement Generation from Thermal Spin States via Unitary Beam Splitters
D. Markham, M. Murao, V. Vedral
We suggest a method of generating distillable entanglement form mixed states unitarily, by utilizing the flexibility of dimension od occupied Hilbert space. We present a model of a…
Multi-party entanglement in graph states
M. Hein, J. Eisert, H. J. Briegel
Graph states are multi-particle entangled states that correspond to mathematical graphs, where the vertices of the graph take the role of quantum spin systems and edges represent I…