Dissipative scheme to approach the boundary of two-qubit entangled mixed states

  title={Dissipative scheme to approach the boundary of two-qubit entangled mixed states},
  author={Steve Campbell and Mauro Paternostro},
  journal={Physical Review A},
We discuss the generation of states close to the boundary family of maximally entangled mixed states as defined by the use of concurrence and linear entropy. The coupling of two qubits to a dissipation-affected bosonic mode is able to produce a bipartite state having, for all practical purposes, the entanglement and mixedness properties of one of such boundary states. We thoroughly study the effects that thermal and squeezed characters of the bosonic mode have in such a process and we discuss… 

Figures from this paper

Interplay between entanglement and entropy in two-qubit systems

We study the exact entanglement and entropy dynamics of two qubits interacting with a common zero-temperature non-Markovian reservoir. It is a commonly held view that entanglement loss due to

Steady-state entanglement of two coupled qubits

The maximum entanglement allowed between two coupled qubits in the steady state established by independent incoherent sources of excitation is reported. Asymmetric configurations where one qubit is

Robust multipartite entanglement generation via a collision model

We examine a simple scheme to generate genuine multipartite entangled states across disjoint qubit registers. We employ a shuttle qubit that is sequentially coupled, in an energy preserving manner,

Robust multipartite entanglement generation via cascaded interactions

It is established that stable $W$-type entanglement can be generated among all qubits within the registers, and that the entangled states are sensitive to how the shuttle is discarded.

Application of Y(sl(2)) Algebra for Entanglement of Two-Qubit System

We construct the transition operators in terms of the generators of the general Yangian and the reduced Yangian. By acting these operators on a two-qubit pure state, we find that the entanglement

Connection among entanglement, mixedness, and nonlocality in a dynamical context

We investigate the dynamical relations among entanglement, mixedness, and nonlocality, quantified by concurrence C, purity P, and maximum Bell function B, respectively, in a system of two qubits in a

Partial entropy change and entanglement in the mixed state for a Jaynes–Cummings model with Kerr medium

By using the algebraic dynamical approach, an atom-field bipartite system in mixed state is employed to investigate the partial entropy change and the entanglement in a cavity filled with Kerr

Control of quantum information flow and quantum correlations in the two-atom Tavis–Cummings model

We investigate the quantum information of the two non-interacting two-level atoms coupled to a single mode of the cavity field via selective measurements. It is found that the information of the two

Teleporting bipartite entanglement using maximally entangled mixed channels

The ability to teleport entanglement through maximally entangled mixed states as defined by concurrence and linear entropy is studied. We show how the teleported entanglement depends on the quality



Entanglement and entropy engineering of atomic two-qubit States.

A scheme employing quantum-reservoir engineering to controllably entangle the internal states of two atoms trapped in a high-finesse optical cavity and can prepare entangled mixed states with any allowed combination of linear entropy and entanglement of formation.

Dynamical entanglement transfer for quantum-information networks

A key element in the architecture of a quantum-information processing network is a reliable physical interface between fields and qubits. We study a process of entanglement transfer engineering,

Maximally entangled mixed states: creation and concentration.

Using correlated photons from parametric down-conversion, maximally entangled mixed states are created and characterized that lie above the Werner boundary in the linear entropy-tangle plane, and a previously unsuspected sensitivity imbalance in common state measures is investigated.

Ordering two-qubit states with concurrence and negativity

We study the ordering of two-qubit states with respect to the degree of bipartite entanglement using the Wootters concurrence - a measure of the entanglement of formation - and the negativity - a

Subsystem purity as an enforcer of entanglement.

It is shown that entanglement can always arise in the interaction of an arbitrarily large system in any mixed state with a single qubit in a pure state, and the time and temperature variation of a lower bound on the amount of entanglements produced is found.

Entanglement between two superconducting qubits via interaction with nonclassical radiation

Control of the dynamics of a complex quantum system requires a trade-off between tunability and protection against noise. To this end one can be interested in processes where some physical properties

Generation and characterization of Werner states and maximally entangled mixed states by a universal source of entanglement.

Werner states and maximally entangled mixed states, two well-known families of mixed states important for quantum information, have been created and fully characterized by this technique and the nonlocal properties of these states are investigated and tested.

Maximal entanglement versus entropy for mixed quantum states

Maximally entangled mixed states are those states that, for a given mixedness, achieve the greatest possible entanglement. For two-qubit systems and for various combinations of entanglement and

Four qubits can be entangled in nine different ways

We consider a single copy of a pure four-partite state of qubits and investigate its behavior under the action of stochastic local quantum operations assisted by classical communication (SLOCC). This

Classification of mixed three-qubit states.

A classification of mixed three-qubit states is introduced, in which the classes of separable, biseparable, W, and Greenberger-Horne-Zeilinger states are successively embedded into each other.