搜索结果: 1-15 共查到“量子力学 system”相关记录30条 . 查询时间(0.218 秒)
Buckled nano rod - a two state system: quantum effects on its dynamics
Buckled nano rod two state system quantum effects dynamics
2011/8/4
Abstract: We consider a suspended elastic rod under longitudinal compression. The compression can be used to adjust potential energy for transverse displacements from harmonic to double well regime. T...
Irreversible evolution of a two-nucleus spin NMR system - subdynamics approach
Irreversible evolution spin NMR system subdynamics approach
2010/11/8
The time irreversible evolution of a two-nucleus spin system interacting with a magnetic field is analyzed in the framework of the subdynamics theory. The spin system is determined by the H(1), C(13) ...
Open system quantum dynamics with correlated initial states, not completely positive maps and non-Markovianity
quantum dynamics non-Markovianity Quantum Physics
2010/11/8
Dynamical A and B maps have been employed extensively by Sudarshan and co-workers to investigate open system evolution of quantum systems. A canonical structure of the A-map is introduced here. It is ...
Entanglement dynamics of bipartite system in squeezed vacuum reservoirs
squeezed vacuum reservoirs bipartite system Quantum Physics
2010/11/8
Entanglement plays a crucial role in quantum information protocols, thus the dynamical behavior of entangled states is of a great importance. In this paper we suggest a useful scheme that permits a di...
Entanglement dynamics of two-bipartite system under the influence of dissipative environments
dissipative environments Quantum Physics
2010/11/8
An experimental scheme is suggested that permits a direct measure of entanglement in a two-qubit cavity system. It is realized in the cavity-QED technology utilizing atoms as flying qubits. With this ...
Initial correlations in open system's dynamics: The Jaynes-Cummings model
Initial correlations open system's dynamics Jaynes-Cummings model
2010/11/8
Employing the trace distance as a measure for the distinguishability of quantum states, we study the influence of initial correlations on the dynamics of open systems. We concentrate on the Jaynes-Cu...
Geometric measure of quantum discord for an arbitrary state of a bipartite quantum system
Geometric measure quantum discord for arbitrary state bipartite quantum system
2010/11/4
Quantum discord, as introduced by Olliver and Zurek [Phys. Rev. Lett. \textbf{88}, 017901 (2001)], is a measure of the discrepancy between quantum versions of two classically equivalent expressions fo...
Dynamical cooling of a single-reservoir open quantum system via optimal control
Dynamical cooling single-reservoir quantum system via optimal control
2010/11/9
Based on an exact description of open quantum systems in terms of stochastic Liouville-von Neumann equations optimal control is investigated without rotating-wave or Markovian approximations. Within t...
Field-induced decay of quantum vacuum: visualizing pair production in a classical photonic system
quantum vacuum visualizing pair production classical photonic system
2010/10/18
The phenomenon of vacuum decay, i.e. electron-positron pair production due to the instability of the quantum electrodynamics vacuum in an external field, is a remarkable prediction of Dirac theory who...
We discuss a cluster-like 1D system with triplet interaction. We study the topological properties of this system. We find that the degeneracy depends on the topology of the system, and well protected ...
Spatial entanglement using quantum walk on many body system
Spatial entanglement quantum body system
2010/4/7
Evolution of many particles on a one dimensional lattice subjected to quantum walk can cause spatial entanglement in the lattice position which can be exploited for quantum information/communication p...
Quantum jumps and spin dynamics of interacting atoms in a strongly coupled atom-cavity system
Quantum jumps spin dynamics atoms strongly coupled atom-cavity system
2010/4/9
We experimentally investigate the spin dynamics of one and two neutral atoms strongly coupled to a high finesse optical cavity. We observe quantum jumps between hyperfine ground states of a single ato...
Quantum entanglement in a many-body system exhibiting multiple quantum phase transitions
Quantum phase transitions Many body systems
2010/7/5
We investigate the quantum entanglement-related features of the many-body model of Plastino and Moszkowski [N. Cimento 47 (1978) 470]. This is an exactly solvable N-body, SU2 two-level model exhibitin...
Fully automated entanglement-based quantum cryptography system for telecom fiber networks
quantum cryptography system telecom fiber networks
2010/4/8
We present a quantum key distribution (QKD) system based on polarisation entanglement for use in telecom fibers. A QKD exchange up to 50km was demonstrated in the laboratory with a secure key rate of ...
On the Contractivity of Hilbert-Schmidt distance under open system dynamics
Hilbert-Schmidt distance system dynamics
2010/4/12
We show that the Hilbert-Schmidt distance, unlike the trace distance, between quantum states is generally not monotonic for open quantum systems subject to Lindblad semigroup dynamics. Sufficient cond...