Showing papers on "Quantum channel published in 1992"
TL;DR: In this paper, the existence of classical and Grassmanian limits of q-integration is proved, and the quantum versions of Cauchy's and Stokes' theorems are formulated.
Abstract: q-integration is defined for the complex quantum plane. The existence of classical and Grassmanian limits of q-integration is proved. Quantum versions of Cauchy's and Stokes' theorems are formulated.
18 citations
TL;DR: In this paper, a transfer matrix method is formulated for calcualting electron transport in a one-dimensional quantum channel having complicated structure and connected to two-dimensional electron reservoirs, and it is shown that singlet conductance peaks can appear at energies below the threshold of the lowest subband.
9 citations
6 citations
TL;DR: In this article, a general from of the universal R-matrix for arbitrary matrix quantum groups is derived, with the use of the generalization of the induced representation technique particular factorized scattering matrices associated with the considered quantum groups.
4 citations
TL;DR: In this article, the quantum algebraic structures associated with a family of R-matrices one extracts from the Perk-Schultz model are studied, starting with the quantum spaces one can define from the Rmatrices, and showing how different duality conditions at the level of quantum spaces (Manin's construction) translate in different quantum groups and quantized universal enveloping algebras.
Abstract: The quantum algebraic structures associated with a family of R-matrices one extracts from the Perk-Schultz model are studied. Starting with the quantum spaces one can define from the R-matrices, the author shows how different duality conditions at the level of quantum spaces (Manin's construction) translate in different quantum groups and quantized universal enveloping algebras.
3 citations
02 Oct 1992
TL;DR: The most efficient way of retrieving quantum information is not a direct uquantum measurement” (as defined by von Neumann), but an indirect method similar to heterodyne detection in communications engineering.
Abstract: Information encoded in non-orthogonal quantum states cannot be duplicated, nor amplified, and in general at is only partly recoverable. The most efficient way of retrieving it is not a direct uquantum measurement” (as defined by von Neumann), but an indirect method similar to heterodyne detection in communications engineering. The mathematical representation of this process requires the introduction of a positive operator valued measure. The optimization of these measures is not yet fully undersiood. An interesting and potentially important application of quantum information is its use an cryptography.
2 citations
01 Jan 1992
TL;DR: In this article, a new scheme for the reconstruction and approximation of quantum wave functions is derived within the context of Information Theory, applied to the inference of the energy spectra and the pertinent eigen states of special hamiltonians from incomplete information concerning the system's ground state, and the development of an approximation for the ground state of a superconducting many-fermion model.
Abstract: A new scheme for the reconstruction and approximation of quantum wave functions is derived within the context of Information Theory. The method is applied to the inference of the energy spectra and the pertinent eigenstates of special hamiltonians from incomplete information concerning the system’s ground state, and to the development of an approximation for the ground state of a superconducting many-fermion model. A substantial improvement over standard and projected BCS approximations is obtained, especially in transitional regions.
1 citations
TL;DR: By means of symplectic geometry, the author discusses the quantum q-deformed symmetric top system and shows that the system in which quantum group SUq(2) is realized in the system is an exactly solved model.
Abstract: By means of symplectic geometry, the author discusses the quantum q-deformed symmetric top system. Quantum group SUq(2) is realized in the system. He shows that the quantum q-deformed symmetric top system in which quantum group is realized and the quantum undeformed symmetric top system in which Lie group is realized correspond to the same Heisenberg equations and then the quantum q-deformed symmetric top is an exactly solved model.
1 citations
16 Nov 1992
TL;DR: In this paper, the authors considered the linear depression process and showed that the result of the conditional unitary process exactly agrees with that of the conventional unitary processes and provided progress towards a new theory in quantum communications.
Abstract: The authors consider the example of the linear depression process. It was evident that the result of the conditional unitary process exactly agrees with that of the conventional unitary process. This new process can provide progress towards a new theory in quantum communications. >
16 Nov 1992
TL;DR: In this article, the authors discuss the concepts of received quantum state control and quantum state switches, and propose a new quantum state switch system, which is a quantum conditional unitary system and can overcome the standard quantum limit.
Abstract: The authors discuss the concepts of received quantum state control and quantum state switches, and propose a new quantum state switch system. It is shown that the new system is a quantum conditional unitary system and can overcome the standard quantum limit. >
TL;DR: In this article, the crossover properties of the quantum conductance in a 1D constriction from the ballistic to the diffusive regime are investigated analytically, and the well-known plateau structures are found.