In-phase and anti-phase entanglement dynamics of Rydberg atomic pairs

Zhang, Han-Xiao; Fan, Chu-Hui; Wu, Jin-Hui

doi:10.1364/oe.408799

Cited by 5 publications

(3 citation statements)

References 73 publications

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“…On the one hand, atoms are usually well-localized spatially for precisely controlling the Rydberg interactions. For example, achieving in-phase (antiphase) dynamics of Rydberg excitations in a bipartite atomic system and entanglement of Rydberg atomic pair in a quadripartite atomic system, where the atoms are neatly arranged in space [41,42]. However on the other hand, without precisely controlling interactions, the quantum information tasks can also be accomplished very well as long as the system enters the rigid Rydberg blockade regime, for example by implementing a mesoscopic Rydberg gate with a single auxiliary atom and a superatom (SA) [43].…”

Section: Introductionmentioning

confidence: 99%

Dynamical Collective Excitations and Entanglement of Two Strongly Correlated Rydberg Superatoms

et al. 2022

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Based on the dipole blockade effect and with the aid of the superatom (SA) model, we propose a scheme to investigate the correlated evolution of two Rydberg sub-superatoms (SSAs), formed by two spatially separated atomic Rydberg sub-ensembles but in the same blockade region. Starting from the pure separable states, we investigate the in-phase or anti-phase correlated dynamics and explore how two Rydberg SSAs entangle with each other mediated by a single Rydberg excitation. Starting from the entangled states, we discuss the robustness of the system against decoherence induced by the dephasing rate. Our results show that both the correlated evolution of two Rydberg SSAs and their collective-state entanglement are usually sensitive to the number of each Rydberg SSA. This allows us to coherently manipulate the Rydberg ensemble over long distances from the single-quantum level to the mesoscopic level by changing the number of atoms. Furthermore, the method for dividing an SA into two SSAs and obtaining their spin operators without any approximation can be readily generalized to the case of many SSAs. It may have potential promising applications in quantum information processing and provide an attractive platform to study the quantum-classical correspondence, many-body physics and so on.

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Section: Introductionmentioning

confidence: 99%

Dynamical Collective Excitations and Entanglement of Two Strongly Correlated Rydberg Superatoms

et al. 2022

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“…Recently, a system of two coupled qubits interacting with a common environment was investigated, where schemes to avoid ESD using Local unitary operations were provided [ 54 ]. Very recently, the entanglement dynamics of a pair of well-separated Rydberg pairs driven by a common laser field while interacting via both intra-pair and inter-pair van der Waals potentials was investigated [ 55 ]. It showed in-phase (anti-phase) beating dynamics that depends on the inter-pair potentials and the field detuning.…”

Section: Introductionmentioning

confidence: 99%

Asymptotic Entanglement Sudden Death in Two Atoms with Dipole–Dipole and Ising Interactions Coupled to a Radiation Field at Non-Zero Detuning

Sadiek

Al-Dress

Shaglel

et al. 2021

Entropy

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We investigate the time evolution and asymptotic behavior of a system of two two-level atoms (qubits) interacting off-resonance with a single mode radiation field. The two atoms are coupled to each other through dipole--dipole as well as Ising interactions. An exact analytic solution for the system dynamics that spans the entire phase space is provided. We focus on initial states that cause the system to evolve to entanglement sudden death (ESD) between the two atoms. We find that combining the Ising and dipole--dipole interactions is very powerful in controlling the entanglement dynamics and ESD compared with either one of them separately. Their effects on eliminating ESD may add up constructively or destructively depending on the type of Ising interaction (Ferromagnetic or anti-Ferromagnetic), the detuning parameter value, and the initial state of the system. The asymptotic behavior of the ESD is found to depend substantially on the initial state of the system, where ESD can be entirely eliminated by tuning the system parameters except in the case of an initial correlated Bell state. Interestingly, the entanglement, atomic population and quantum correlation between the two atoms and the field synchronize and reach asymptotically quasi-steady dynamic states. Each one of them ends up as a continuous irregular oscillation, where the collapse periods vanish, with a limited amplitude and an approximately constant mean value that depend on the initial state and the system parameters choice. This indicates an asymptotic continuous exchange of energy (and strong quantum correlation) between the atoms and the field takes place, accompanied by diminished ESD for these chosen setups of the system. This system can be realized in spin states of quantum dots or Rydberg atoms in optical cavities, and superconducting or hybrid qubits in linear resonators.

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“…Therefore, it is of great practical significance to study the generation, protection, and enhancement of entanglement and coherence in open quantum systems. Over the past few decades, significant attention has been devoted to entanglement and coherence generation [17][18][19][20][21][22][23][24][25][26][27] as well as the dynamics of entanglement and coherence of open quantum systems [28][29][30][31][32][33][34][35][36][37][38][39][40][41]. Many methods for enhancing quantum entanglement and suppressing decoherence [42][43][44][45][46][47][48][49][50] in open quantum systems have been proposed in equilibrium environments.…”

Section: Introductionmentioning

confidence: 99%

Improving the steady-state coherence and entanglement of two coupled qubits via composite system-reservoir interactions

Li¹,

Man²,

Xia³

2021

Phys. Scr.

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In this work, we study the improvement of steady-state coherence (SSC) and steady-state entanglement (SSE) of two coupled qubits by means of composite system-reservoir interaction constructed by a linear combination of orthogonal and parallel ones. We show that in the non-equilibrium case, the SSC and SSE can be significantly enhanced by increasing the parallel components of the interaction Hamiltonian between the system of interest and the heat reservoirs. In addition, we find that in the non-equilibrium case, increasing the parallel components can enlarge the temperature (temperature difference) region where the SSC can maintain nonzero values. In the equilibrium situation, however, the SSC and SSE are not affected by the parallel components of the composite system-reservoir interactions.

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In-phase and anti-phase entanglement dynamics of Rydberg atomic pairs

Cited by 5 publications

References 73 publications

Dynamical Collective Excitations and Entanglement of Two Strongly Correlated Rydberg Superatoms

Dynamical Collective Excitations and Entanglement of Two Strongly Correlated Rydberg Superatoms

Asymptotic Entanglement Sudden Death in Two Atoms with Dipole–Dipole and Ising Interactions Coupled to a Radiation Field at Non-Zero Detuning

Improving the steady-state coherence and entanglement of two coupled qubits via composite system-reservoir interactions

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