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17 papers · 1 filter
Superselection Rules in Quantum Cryptography
Dominic Mayers
It is believed that superselection rules in quantum mechanics can restrict the possible operation on a qbit. If this was true, the model used by Mayers for the impossibility of bit…
Wilson-Kadanoff Renormalization Group in Higher Orders: One-Dimensional g-ology Model as an Example
G. Y. Chitov, C. Bourbonnais
We apply the standard Wilson-Kadanoff (WK) momentum-space Renormalization Group (RG) scheme for the g-ology model of one-dimensional fermions. By explicitly carrying out calculatio…
A common algebraic description for probabilistic and quantum computations
Martin Beaudry, Jose M. Fernandez, Markus Holzer
We study the computational complexity of the problem SFT (Sum-free Formula partial Trace): given a tensor formula F over a subsemiring of the complex field (C,+,.) plus a positive…
Campbell Penetration Depth of a Superconductor in the Critical State
R. Prozorov, R. W. Giannetta, N. Kameda +3
The magnetic penetration depth was measured in the presence of a slowly relaxing supercurrent, . In single crystal below approximately 25…
A Renormalization Group Method for Quasi One-dimensional Quantum Hamiltonians
S. Moukouri, L. G. Caron
A density-matrix renormalization group (DMRG) method for highly anisotropic two-dimensional systems is presented. The method consists in applying the usual DMRG in two steps. In th…
Smearing of charge fluctuations in a grain by spin-flip assisted tunneling
Karyn Le Hur, Pascal Simon
We investigate the charge fluctuations of a grain (large dot) coupled to a lead via a small quantum dot in the Kondo regime. We show that the strong entanglement of charge and spin…