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of 1 133
pro vyhledávání: '"Janszky, J."'
We consider the optimal approximation of certain quantum states of a harmonic oscillator with the superposition of a finite number of coherent states in phase space placed either on an ellipse or on a certain lattice. These scenarios are currently ex
Externí odkaz:
http://arxiv.org/abs/1411.6781
Publikováno v:
Phys. Rev. A 73, 062301 (2006)
A necessary and sufficient condition is given for general exact remote state preparation (RSP) protocols to be oblivious, that is, no information about the target state can be retrieved from the classical message. A novel criterion in terms of commut
Externí odkaz:
http://arxiv.org/abs/quant-ph/0605057
Publikováno v:
Phys. Rev. A 72, 052315 (2005)
We extend exact deterministic remote state preparation (RSP) with minimal classical communication to quantum systems of continuous variables. We show that, in principle, it is possible to remotely prepare states of an ensemble that is parameterized b
Externí odkaz:
http://arxiv.org/abs/quant-ph/0510074
Publikováno v:
Fortschr. Phys. 49, 1019-1025 (2001)
The relations of antilinear maps, bipartite states and quantum channels is summarized. Antilinear maps are applied to describe bipartite states and entanglement. Teleportation is treated in this general formalism with an emphasis on conditional schem
Externí odkaz:
http://arxiv.org/abs/quant-ph/0308020
A system of coherently-driven two-level atoms is analyzed in presence of two independent stochastic perturbations: one due to collisions and a second one due to phase fluctuations of the driving field. The behaviour of the quantum interference induce
Externí odkaz:
http://arxiv.org/abs/quant-ph/0302151
Stochastic perturbation of two-level atoms strongly driven by a coherent light field is analyzed by the quantum trajectory method. A new method is developed for calculating the resonance fluorescence spectra from numerical simulations. It is shown th
Externí odkaz:
http://arxiv.org/abs/quant-ph/0207016
Publikováno v:
Phys. Rev. A. vol. 64, No. 034301 (2001.)
We present a unified approach to quantum teleportation in arbitrary dimensions based on the Wigner-function formalism. This approach provides us with a clear picture of all manipulations performed in the teleportation protocol. In addition within the
Externí odkaz:
http://arxiv.org/abs/quant-ph/0106109
A beam of diatomic molecules scattered off a standing wave laser mode splits according to the rovibrational quantum state of the molecules. Our numerical calculation shows that single state resolution can be achieved by properly tuned, monochromatic
Externí odkaz:
http://arxiv.org/abs/quant-ph/0011092
Publikováno v:
J. Phys A (Math. Gen.) vol. 34, pp. 6949-6955 (2001)
The role of the off-diagonal density matrix elements of the entangled pair is investigated in quantum teleportation of a qbit. The dependence between them and the off-diagonal elements of the teleported density matrix is shown to be linear. In this w
Externí odkaz:
http://arxiv.org/abs/quant-ph/0011083
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