Transferring entanglement to the steady state of flying qubits

Guo, Yanqiang; Li, Jie; Zhang, Tiancai; Paternostro, Mauro

doi:10.1103/physreva.86.052315

Cited by 8 publications

(5 citation statements)

References 60 publications

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“…The cells could be independent [16][17][18][19][20], or coupled to each other through the overlapping field modes [21][22][23][24][25][26], connected by a short fibre [27][28][29][30][31][32]. In these schemes, photons act as carriers for the transfer of quantum states and controlled transfer is implemented by an appropriate choice of the coupling strength of the overlapping field modes.…”

Section: Introductionmentioning

confidence: 99%

Atoms versus photons as carriers of quantum states

Bougouffa

Ficek

2013

Phys. Rev. A

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The problem of the complete transfer of quantum states and entanglement in a four-qubit system composed of two single-mode cavities and two two-level atoms is investigated. The transfer of single and double excitation states is discussed for two different coupling configurations between the qubits. In the first, the coupling is mediated by the atoms that simultaneously couple to the cavity modes. In the second configuration, each atom resides inside one of the cavities and the coupling between the cavities is mediated by the overlapping field modes. A proper choice of basis states makes it possible to identify states that could be completely transferred between themselves. Simple expressions are derived for the conditions for the complete transfer of quantum states and entanglement. These conditions impose severe constraints on the evolution of the system in the form of constants of motion. The constrains on the evolution of the system imply that not all states can evolve in time, and we find that the evolution of the entire system can be confined into that occurring among two states only. Detailed analysis show that in the case where the interaction is mediated by the atoms, only symmetric superposition states can be completely and reversibly transferred between the atoms and the cavity modes. In the case where the interaction is mediated by the overlapping field modes, both symmetric and antisymmetric superposition states can be completely transferred. We also show that the system is capable of generating purely photonic NOON states, but only if the coupling is mediated by the atoms, and demonstrate that the ability to generate the NOON states relies on perfect transfer of an entanglement from the atoms to the cavity modes.

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Section: Introductionmentioning

confidence: 99%

Atoms versus photons as carriers of quantum states

Bougouffa

Ficek

2013

Phys. Rev. A

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“…The obtained results could serve for different tasks of quantum information. For instance, the obtained results about the coupling type of the entangled qubits to the reservoir could be useful for the flying qubits (Guo et al, 2012) carrying quantum information. On the other hand, the second significant result of the current study asserts that the entanglement lifetime could last longer for the interacting qubits may not be suitable for flying qubits as the interaction of flying qubits is still a challenge.…”

Section: Discussionmentioning

confidence: 99%

Decay of Entanglement of Correlated Qubits Through Bosonic Fields

Türkpençe¹

2021

Indonesian J. Sci. Technol

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Distribution of entangled parties with the longest time possible is of importance to quantum communication. Therefore, analyzing the decay character of entanglement of correlated qubits in the presence of reservoir effects is of significance to the quantum-based technologies. This study covers the analysis of the temporal entanglement decay of two maximally entangled qubits against different reservoir types and system parameters. It is shown how varying the coupling type of the system to the environment affects the lifetime of entanglement. In the presence of quantum interaction between entangled qubits, it is possible to enlarge the entanglement lifetime depending on the initialization of entanglement. Model parameters used in the numerical calculations and the results are general enough to be applied in any specific quantum-based experimental task.

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“…Such a linear-sweep model was used elsewhere to describe the sudden and adiabatic frequency in a quantum harmonic oscillator for studying the squeezing characteristics [27,28]. It is worth mentioning that other forms of f(t) are also very important in the JC model, for example, studying the effect of atomic motion on quantum entanglement [29,30]. Supposing an atom moves in a cavity along the z-axis direction, then f(t) is equal to π ( )…”

Section: Atoms Undergoing One-photon Processesmentioning

confidence: 99%

Delaying disappearance of entanglement by the linear modulation of atom-field coupling

Hu¹,

Tan²

2014

Phys. Scr.

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By considering a double Jaynes-Cummings (JC) model with linear modulation of the atom-field coupling coefficients, we investigate the entanglement evolution between two atoms, and focuss on the effect of the linear sweep on the entanglement. The results show that the entanglement is very sensitive to the linear modulation of the atom-field coupling coefficients. Both for onephoton processes and for two-photon processes, the disappearance of the initial entanglement is delayed due to the linear modulation as compared to the double standard JC model, and the delayed time is long or short depending on the value of the parameters in the modulation function. Moreover, the entanglement of the two atoms in the double standard JC model disappears periodically. However, this periodicity is completely lost in the linear modulation case. In addition, the larger the photon numbers in the cavities, the shorter the delayed time of the disappearance of the initial entanglement.

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Transferring entanglement to the steady state of flying qubits

Cited by 8 publications

References 60 publications

Atoms versus photons as carriers of quantum states

Atoms versus photons as carriers of quantum states

Decay of Entanglement of Correlated Qubits Through Bosonic Fields

Delaying disappearance of entanglement by the linear modulation of atom-field coupling

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