Enhanced entanglement of two atoms confined in a multi-mode optical cavity

Taneichi, Takashi; Kobayashi, Takayoshi

doi:10.1016/s0009-2614(03)01330-7

Cited by 4 publications

(5 citation statements)

References 26 publications

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“…Namely, if the total system (atoms and modes) is in an initial state described by the density matrixχ SC (0), then the appropriate initial density matrix for the TC model is obtained by making the mode transformation of Eqs. (15) and (16) and tracing out the second transformed mode T F 2 . As this mapping of initial states involves a partial trace, it is a many-to-one mapping from the SC problem to the TC problem (and this mapping does not preserve purity).…”

Section: Special Casesmentioning

confidence: 99%

“…However, such a simplistic model may miss the variety of behavior that can result when the atoms are not confined to such a small sample. Entanglement dynamics have been shown to have a significant distance dependence when two atoms are interacting with a common field [15]. For atoms weakly interacting with a continuum of field modes in the Born-Markov approximation, it has been shown [16][17][18][19] that changing the atomic separation of two atoms can affect whether there is SD and whether there is revival of entanglement, as well as modify the dynamical generation of entanglement; in short, the qualitative features are sensitive to the atomic spacing.…”

Section: Introductionmentioning

confidence: 99%

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Effect of interatomic separation on entanglement dynamics in a two-atom two-mode model

Sinha

Cummings

2012

J. Phys. B: At. Mol. Opt. Phys.

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We analyze the time evolution of quantum entanglement in a model consisting of two two-level atoms interacting with a two-mode electromagnetic field for a variety of initial states and interatomic separations. We study two specific atomic separations which give rise to symmetric atom-field couplings. For general atomic distances we consider a subset of initial states analytically, and then treat the more general situation numerically. We examine a variety of qualitative features such as entanglement sudden death, dynamical generation, protection, and transfer between subsystems. Our analysis shows a stark contrast in features of entanglement between the two special coupling schemes often considered; further, these features are uncharacteristic of those arising for general distances, due to the high degree of symmetry present in the special cases. The variety of behaviors in these two-mode cases suggest the importance of considering atomic separation carefully for any model where two atoms interact with a common field.

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Section: Special Casesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of interatomic separation on entanglement dynamics in a two-atom two-mode model

Sinha

Cummings

2012

J. Phys. B: At. Mol. Opt. Phys.

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“…For these cavities, the regime of strong coupling was observed with single atoms, with dilute atomic samples and with Bose-Einstein condensates [13,14]. The inclusion of multiple cavity modes in the dynamics is predicted to lead to an increase of the atom-field coupling, and to the enhancement of several cavity effects, as for example the atomic enhanced entanglement in optical cavities [15] or an increase in the capture range of cavity cooling [16]. Furthermore this also opens up new schemes in quantum information processing using different cavity modes as qubits interacting via the atoms stored in the cavity [17], and is an important element in the implementation of quantum spin glasses with ultracold atoms [18].…”

Section: Introductionmentioning

confidence: 99%

Collective strong coupling in multimode cavity QED

et al. 2013

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We study an atom-cavity system in which the cavity has several degenerate transverse modes. Mode-resolved cavity transmission spectroscopy reveals well-resolved atom-cavity resonances for several cavity modes, a signature of collective strong coupling for the different modes. Furthermore, the experiment shows that the cavity modes are coupled via the atomic ensemble contained in the cavity. The experimental observations are supported by a detailed theoretical analysis. The work paves the way to the use of interacting degenerate modes in cavity-based quantum information processing, where qubits corresponding to different cavity modes interact via an atom shared by the two modes. Our results are also relevant to the experimental realization of quantum spin glasses with ultracold atoms.

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“…Most of the theoretical and experimental studies concentrate on the single-mode cavity field interacting with single atom [ 31 ]. Therefore, multi-mode cavity field interactions may improve the correlation in the quantum system [ 32 ]. The high-order nonlinearity of the interactions between atoms and multi-mode cavity were subjected to several applications in quantum information [ 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Two-Qubit Local Fisher Information Correlation beyond Entanglement in a Nonlinear Generalized Cavity with an Intrinsic Decoherence

Mohamed

Khalil

Yassen

et al. 2021

Entropy

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In this paper, we study a Hamiltonian system constituted by two coupled two-level atoms (qubits) interacting with a nonlinear generalized cavity field. The nonclassical two-qubit correlation dynamics are investigated using Bures distance entanglement and local quantum Fisher information under the influences of intrinsic decoherence and qubit–qubit interaction. The effects of the superposition of two identical generalized coherent states and the initial coherent field intensity on the generated two-qubit correlations are investigated. Entanglement of sudden death and sudden birth of the Bures distance entanglement as well as the sudden changes in local Fisher information are observed. We show that the robustness, against decoherence, of the generated two-qubit correlations can be controlled by qubit–qubit coupling and the initial coherent cavity states.

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Enhanced entanglement of two atoms confined in a multi-mode optical cavity

Cited by 4 publications

References 26 publications

Effect of interatomic separation on entanglement dynamics in a two-atom two-mode model

Effect of interatomic separation on entanglement dynamics in a two-atom two-mode model

Collective strong coupling in multimode cavity QED

Two-Qubit Local Fisher Information Correlation beyond Entanglement in a Nonlinear Generalized Cavity with an Intrinsic Decoherence

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