Entanglement swapping between dissipative systems

Nourmandipour, Alireza; Tavassoly, M. K.

doi:10.1103/physreva.94.022339

Cited by 19 publications

(15 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximum amount of linear entropy is obtained for θ = 0. For β = 0, we recover the results presented in [62].…”

Section: Atom-field Entanglement Of Subsystemssupporting

confidence: 79%

Qubit Movement-Assisted Entanglement Swapping

Golkar,

Tavassoly,

Nourmandipour

2019

Preprint

View full text Add to dashboard Cite

In this paper, we propose a scheme to generate entanglement between two distant qubits (two-level atom) which are separately trapped in their own (in general) non-Markovian dissipative cavities by utilizing entangling swapping. We consider the case in which the qubits can move along their cavity axes rather than a static state of motion. We first examine the role of movement of the qubit by studying the entropy evolution for each subsystem. We calculate the average entropy over the initial states of the qubit. Then by performing a Bell state measurement on the fields leaving the cavities, we swap the entanglement between qubit-field in each cavity into qubitqubit and field-field subsystems. We use the entangling power to measure the average amount of swapped entanglement over all possible pure initial states. Our results are presented in two weak and strong coupling regimes. Our results illustrate the positive role of the movement of the qubits on the swapped entanglement. It is revealed that by considering certain conditions for the initial state of qubits, it is possible to achieve a maximally long-leaving stationary entanglement (Bell state) which is entirely independent of the environmental variables as well as the velocity of qubits. This happens when the two qubits have the same velocities.

show abstract

“…The maximum amount of linear entropy is obtained for θ = 0. For β = 0, we recover the results presented in [62].…”

Section: Atom-field Entanglement Of Subsystemssupporting

confidence: 79%

Qubit Movement-Assisted Entanglement Swapping

Golkar,

Tavassoly,

Nourmandipour

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…It also has been put forward the idea that, entanglement may be generated between subsystems that never directly interacted by means of entanglement swapping [12]. Recently, it has been reported that the entanglement swapping can also be occurred between dissipative systems [13,14].…”

Section: Introductionmentioning

confidence: 99%

Entanglement dynamics of moving qubits in a common environment

2020

View full text Add to dashboard Cite

In this paper we provide an analytical investigation of the entanglement dynamics of moving qubits dissipating into a common and (in general) non-Markovian environment for both weak and strong coupling regimes. We first consider the case of two moving qubits in a common environment and then generalize it to an arbitrary number of moving qubits. We show that for an initially entangled state, the environment washes out the initial entanglement after a finite interval of time. We also show that the movement of the qubits can play a constructive role in protecting of the initial entanglement. In this case, we observe a Zeno-like effect due to the velocity of the qubits. On the other hand, by limiting the number of qubits initially in a superposition of single excitation, a stationary entanglement can be achieved between the qubits initially in the excited and ground states. Surprisingly, we illustrate that when the velocity of all qubits are the same, the stationary state of the qubits does not depend on this velocity as well as the environmental properties. This allows us to determine the stationary distribution of the entanglement versus the total number of qubits in the system.

show abstract

“…At first, the entanglement can be generally generated by performing interaction [3][4][5][6][7][8][9] or using beam splitter [10,11]. Secondly, this generated entanglement can be swapped (to the separable pairs) using Bell state measurement (BSM) [12][13][14], beam splitter [15] or via performing interaction between independent particles (QED method) [16]. In quantum repeater protocols, after producing entanglement and swapping entanglement between separable parts appropriately, these entangled states are stored in quantum memories.…”

Section: Introductionmentioning

confidence: 99%

Distributing entangled state using quantum repeater protocol: Trapped atomic ions in optomechanical cavities

Ghasemi

Tavassoly

2020

Physics Letters A

View full text Add to dashboard Cite

Distribution of the entangled state of trapped atomic ions to long distance using quantum repeater protocol is considered. Indeed, the long distance is divided into short parts, and then using entanglement generation and entanglement swapping techniques in optomechanical cavities, the entanglement is distributed. To do the task, we perform interaction between trapped atomic ions in optomechanical cavities, operate proper measurements on trapped ions and also make Bell state measurement as a well-known way to swap the entanglement. Accordingly, the entanglement is distributed between target ions with satisfactory values of success probability and entanglement degree. The effects of detuning and amplitude of pump laser on the entanglement and success probability are evaluated. The fluctuations of entanglement and success probability are decreased by increasing of detuning. Via increasing the amplitude of pump laser, the maxima of entanglement are repeated more times and success probability undergoes the collapse-revival phenomenon.

show abstract

Entanglement swapping between dissipative systems

Cited by 19 publications

References 41 publications

Qubit Movement-Assisted Entanglement Swapping

Qubit Movement-Assisted Entanglement Swapping

Entanglement dynamics of moving qubits in a common environment

Distributing entangled state using quantum repeater protocol: Trapped atomic ions in optomechanical cavities

Contact Info

Product

Resources

About