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Search Results: 1 - 10 of 409237 matches for " J. -H. Ting "
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On Improving Replenishment Lot Size of an Integrated Manufacturing System with Discontinuous Issuing Policy and Imperfect Rework  [PDF]
Ting J. Lee, Singa W. Chiu, Huei H. Chang
American Journal of Industrial and Business Management (AJIBM) , 2011, DOI: 10.4236/ajibm.2011.11003
Abstract: This paper proposes a cost reduction distribution policy for an integrated manufacturing system operating under quality assurance practice. We reexamine the problem studied by Chiu et al. [Numerical method for determination of the optimal lot size for a manufacturing system with discontinuous issuing policy and rework. International Journal for Numerical Methods in Biomedical Engineering, doi:10.1002/cnm.1369] and improve its replenishment lot-size solution in terms of lowering producer’s stock holding cost. Mathematical modeling and analysis is employed in this study and optimal replenishment lot size is derived. A numerical example is provided to show the practical usage of research result as well as to demonstrate significant savings in producer’s holding cost as compared to that in Chiu et al.
Many-Body Separability of Warm Qubits
Ting Yu,J. H. Eberly
Physics , 2007,
Abstract: We analyze the separability of the joint state of a collection of two-level systems at finite temperature T. The fact that only separable states are found in the neighborhood of their thermal equilibrium state guarantees that decoherence will destroy any initially arranged entanglement in a finite time.
Entanglement Evolution in a Non-Markovian Environment
Ting Yu,J. H. Eberly
Physics , 2009, DOI: 10.1016/j.optcom.2009.10.042
Abstract: We extend recent theoretical studies of entanglement dynamics in the presence of environmental noise, following the long-time interest of Krzysztof Wodkiewicz in the effects of stochastic models of noise on quantum optical coherences. We investigate the quantum entanglement dynamics of two spins in the presence of classical Ornstein-Uhlenbeck noise, obtaining exact solutions for evolution dynamics. We consider how entanglement can be affected by non-Markovian noise, and discuss several limiting cases.
Sudden Death of Entanglement: Classical Noise Effects
Ting Yu,J. H. Eberly
Physics , 2006, DOI: 10.1016/j.optcom.2006.01.061
Abstract: When a composite quantum state interacts with its surroundings, both quantum coherence of individual particles and quantum entanglement will decay. We have shown that under vacuum noise, i.e., during spontaneous emission, two-qubit entanglement may terminate abruptly in a finite time [T. Yu and J. H. Eberly, \prl {93}, 140404 (2004)], a phenomenon termed entanglement sudden death (ESD). An open issue is the behavior of mixed-state entanglement under the influence of classical noise. In this paper we investigate entanglement sudden death as it arises from the influence of classical phase noise on two qubits that are initially entangled but have no further mutual interaction.
Finite-Time Disentanglement via Spontaneous Emission
Ting Yu,J. H. Eberly
Physics , 2004, DOI: 10.1103/PhysRevLett.93.140404
Abstract: We show that under the influence of pure vacuum noise two entangled qubits become completely disentangled in a finite time, and in a specific example we find the time to be given by $\ln \Big(\frac{2 +\sqrt 2}{2}\Big)$ times the usual spontaneous lifetime.
Sudden Death of Entanglement
Ting Yu,J. H. Eberly
Physics , 2009, DOI: 10.1126/science.1167343
Abstract: A new development in the dynamical behavior of elementary quantum systems is the surprising discovery that correlation between two quantum units of information called qubits can be degraded by environmental noise in a way not seen previously in studies of dissipation. This new route for dissipation attacks quantum entanglement, the essential resource for quantum information as well as the central feature in the Einstein-Podolsky-Rosen so-called paradox and in discussions of the fate of Schr\"{o}inger's cat. The effect has been labeled ESD, which stands for early-stage disentanglement or, more frequently, entanglement sudden death. We review recent progress in studies focused on this phenomenon.
Qubit Disentanglement and Decoherence via Dephasing
Ting Yu,J. H. Eberly
Physics , 2003, DOI: 10.1103/PhysRevB.68.165322
Abstract: We consider whether quantum coherence in the form of mutual entanglement between a pair of qubits is susceptible to decay that may be more rapid than the decay of the coherence of either qubit individually. An instance of potential importance for solid state quantum computing arises if embedded qubits (spins, quantum dots, Cooper pair boxes, etc.) are exposed to global and local noise at the same time. Here we allow separate phase-noisy channels to affect local and non-local measures of system coherence. We find that the time for decay of the qubit entanglement can be significantly shorter than the time for local dephasing of the individual qubits.
Negative Entanglement Measure, and What It Implies
Ting Yu,J. H. Eberly
Physics , 2007, DOI: 10.1080/09500340701432581
Abstract: In this paper, we extract from concurrence its variable part, denoted $\Lambda$, and use $\Lambda$ as a time-dependent measure of "distance", either postive or negative, from the separability boundary. We use it to investigate entanglement dynamics of two isolated but initially entangled qubits, each coupled to its own environment.
Quantum Open System Theory: Bipartite Aspects
Ting Yu,J. H. Eberly
Physics , 2006, DOI: 10.1103/PhysRevLett.97.140403
Abstract: We demonstrate in straightforward calculations that even under ideally weak noise the relaxation of bipartite open quantum systems contains elements not previously encountered in quantum noise physics. While additivity of decay rates is known to be generic for decoherence of a single system, we demonstrate that it breaks down for bipartite coherence of even the simplest composite systems.
Evolution from Entanglement to Decoherence of Bipartite Mixed "X" States
Ting Yu,J. H. Eberly
Physics , 2005,
Abstract: We examine a class of bipartite mixed states which we call X states and report several analytic results related to the occurrence of so-called entanglement sudden death (ESD) under time evolution in the presence of common types of environmental noise. Avoidance of sudden death by application of purely local operations is shown to be feasible in some cases.
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