Can Thermodynamic Behavior of Alice’s Particle Affect Bob’s Particle? (original) (raw)
Related papers
New Journal of Physics Thermalization in systems with bipartite eigenmode entanglement
2012
It is analytically shown that the asymptotic correlations following a quantum quench in exactly solvable models can sometimes look essentially thermal provided the initial coupling between the system eigenmodes induces a large gap. We study this phenomenon using simple models, which also illustrate the relationship between the entanglement spectrum of the initial state and the generalized Gibbs ensemble describing the long-time correlations after the quench. We also show that the effective temperature characterizing the correlations is not related to the energy fluctuations after the quench, and therefore does not have thermodynamic meaning. The latter observation implies a breakdown of the fluctuation–dissipation theorem. 7 Author to whom any correspondence should be addressed. New Journal of Physics 14 (2012) 075013 1367-2630/12/075013+16$33.00 © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
Teleportation, entanglement and thermodynamics in the quantum world
Contemporary Physics, 1998
Quantum mechanics has many counter-intuitive consequences which contradict our intuition which is based on classical physics. Here we discuss a special aspect of quantum mechanics, namely the possibility of entanglement between two or more particles. We will establish the basic properties of entanglement using quantum state teleportation. These principles will then allow us to formulate quantitative measures of entanglement. Finally we will show that the same general principles can also be used to prove seemingly difficult questions regarding entanglement dynamics very easily. This will be used to motivate the hope that we can construct a thermodynamics of entanglement.
Survival of entanglement in thermal states
EPL (Europhysics Letters), 2008
We present a general sufficiency condition for the presence of multipartite entanglement in thermal states stemming from the ground state entanglement. The condition is written in terms of the ground state entanglement and the partition function and it gives transition temperatures below which entanglement is guaranteed to survive. It is flexible and can be easily adapted to consider entanglement for different splittings, as well as be weakened to allow easier calculations by approximations. Examples where the condition is calculated are given. These examples allow us to characterize a minimum gapping behavior for the survival of entanglement in the thermodynamic limit. Further, the same technique can be used to find noise thresholds in the generation of useful resource states for one-way quantum computing.
Entanglement of two distant qubits driven by thermal environments
Physica Scripta, 2012
A model of entanglement generation of two initially disentangled qubits, each coupled to a separate cavity with the cavities connected by a fiber, is considered. The creation and evolution of the atomic entanglement are studied in the framework of the microscopic master equation capable of describing an open quantum system. The cavities and fiber are coupled to their own thermal environment. In these conditions, we compute the concurrence as a measure of the atomic entanglement and study the contribution of the environments at finite temperature to the dynamics of entanglement. As a result, one finds interesting effects where the thermal baths stimulate the generation of the entanglement in a given range of temperatures and the effect could be seen especially at some stage of the entanglement evolution. The range of temperatures at which entanglement increases is limited by some optimal values, depending on the physical characteristics of the system, such as operating cavity/fiber frequencies, atom-field detuning and couplings, and loss rates.
Entanglement in thermal equilibrium states
We revisit the problem of entanglement of thermal equilibrium states of composite systems. We introduce characteristic, viz. critical, temperatures -and bounds for them marking transitions from entanglement to separability. We present examples for the various possible thermal entanglement scenarios in bipartite qubit/qubit and qubit/qutrit systems.
Non-Markovian thermalization of entangled qubits
Arxiv preprint quant-ph/0604030, 2006
Matthias Jakob and Michael Nölle ARC Seibersdorf Research GmbH, Tech Gate Vienna, Donau-City-Str. 1, A-1220 Vienna, Austria (Dated: February 1, 2008) We study the decoherence properties of an entangled bipartite qubit system, represented by two two-level atoms that ...
Journal of High Energy Physics, 2013
We study entanglement entropy for an excited state by making use of the proposed holographic description of the entanglement entropy. For a sufficiently small entangling region and with reasonable identifications we find an equation between entanglement entropy and energy which is reminiscent of the first law of thermodynamics. We then suggest four statements which might be thought of as four laws of entanglement thermodynamics.
Thermalizing Quantum Machines: Dissipation and Entanglement
Physical Review Letters, 2002
We study the relaxation of a quantum system towards the thermal equilibrium using tools developed within the context of quantum information theory. We consider a model in which the system is a qubit, and reaches equilibrium after several successive two-qubit interactions (thermalizing machines) with qubits of a reservoir. We characterize completely the family of thermalizing machines. The model shows a tight link between dissipation, fluctuations, and the maximal entanglement that can be generated by the machines. The interplay of quantum and classical information processes that give rise to practical irreversibility is discussed.
Creation of Two-Particle Entanglement in Open Macroscopic Quantum Systems
Advances in Mathematical Physics, 2012
We consider an open quantum system ofNnot directly interacting spins (qubits) in contact with both local and collective thermal environments. The qubit-environment interactions are energy conserving. We trace out the variables of the thermal environments andN−2qubits to obtain the time-dependent reduced density matrix for two arbitrary qubits. We numerically simulate the reduced dynamics and the creation of entanglement (concurrence) as a function of the parameters of the thermal environments and the number of qubits,N. Our results demonstrate that the two-qubit entanglement generally decreases asNincreases. We show analytically that, in the limitN→∞, no entanglement can be created. This indicates that collective thermal environments cannot create two-qubit entanglement when many qubits are located within a region of the size of the environment coherence length. We discuss possible relevance of our consideration to recent quantum information devices and biosystems.