Quadripartite continuous-variable entanglement via quadruply concurrent down-conversion

Midgley, S. L. W.; Bradley, Ashton S.; Pfister, Oliver; Olsen, M. K.

doi:10.1103/physreva.81.063834

Cited by 42 publications

(37 citation statements)

References 42 publications

(79 reference statements)

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“…Fourth, we have chosen a scheme in which the signal states have the same energy (aiding measurements with homodyne detection), linewidth, and photonic fraction. Finally, although two excitation lasers are required, this represents an improvement on alternative schemes requiring four lasers [42]. Before describing our model, it is worth noting that a completely analogous scheme can be constructed using the orbital angular momentum carrying modes [43] in mesa structures in semiconductor microcavities.…”

Section: Methodsmentioning

confidence: 99%

Multipartite polariton entanglement in semiconductor microcavities

Liew

Savona

2011

Phys. Rev. A

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We study the entanglement of multiple polariton modes, which results in continuous variable cluster states suitable for quantum computation. Schemes are based on parametric scattering between spin-polarized lower and upper polariton branches in planar microcavities or spin-polarized orbital angular momentum states in mesa structures. Such systems are modeled by numerical solution of truncated density matrices and compared to the solution of the Heisenberg equations for the set of field correlators up to third order. Four-body entanglement is evidenced by violation of the van Loock-Furusawa quadripartite inequalities. We show that the entanglement is able to withstand a realistic strength of pure dephasing present in typical systems.

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Section: Methodsmentioning

confidence: 99%

Multipartite polariton entanglement in semiconductor microcavities

Liew

Savona

2011

Phys. Rev. A

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“…As shown in Ref. [27], these conditions may be optimized for the verification of genuine quadripartite entanglement. It should be noted that other multipartite entanglement witnesses also exist [34].…”

Section: Criteria For Quadripartite Entanglementmentioning

confidence: 99%

Analysis of a continuous-variable quadripartite cluster state from a single optical parametric oscillator

et al. 2010

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We examine the feasibility of generating continuous-variable multipartite entanglement in an intracavity concurrent downconversion scheme that has been proposed for the generation of cluster states by Menicucci et al. [Phys. Rev. Lett. 101, 130501 (2008)]. By calculating optimized versions of the van Loock-Furusawa correlations we demonstrate genuine quadripartite entanglement and investigate the degree of entanglement present. Above the oscillation threshold the basic cluster state geometry under consideration suffers from phase diffusion. We alleviate this problem by incorporating a small injected signal into our analysis. Finally, we investigate squeezed joint operators. While the squeezed joint operators approach zero in the undepleted regime, we find that this is not the case when we consider the full interaction Hamiltonian and the presence of a cavity. In fact, we find that the decay of these operators is minimal in a cavity, and even depletion alone inhibits cluster state formation.

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“…Su et al [24] have prepared the quadripartite GHZ entangled states experimentally. The tripartite and quadripartite GHZ entanglements have been studied in the parametric interactions [25][26][27][28] and in the semiconductor [29]. On the other hand, the cluster entangled states are such that in the limit of infinite squeezing, the states become zero eigenstates of a set of quadrature combinations, p i − j ∈N i x j → 0, ∀i ∈ N .…”

Section: Introductionmentioning

confidence: 99%

Separated atomic ensembles: Multimode squeezed states and multipartite entangled states

2012

Phys. Rev. A

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We show that, in analogy to light fields, effective bosonic modes of atomic ensembles in the Holstein-Primakoff representation can be prepared in multimode squeezed states, and multipartite continuous-variable cluster and Greenberger-Horne-Zeilinger (GHZ) entangled states. Our scheme uses a cascade of optical cavities, in each of which one atomic ensemble is placed. Through Raman transitions between stable atomic ground states, the atomic ensembles are in the interactions with the cavity and laser fields. Because of the long-lived ground states, the atomic ensembles act as quantum network nodes, whose cluster entangled states are applicable in the one-way quantum computer, and whose GHZ entangled states have potential for quantum communication.

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Quadripartite continuous-variable entanglement via quadruply concurrent down-conversion

Cited by 42 publications

References 42 publications

Multipartite polariton entanglement in semiconductor microcavities

Multipartite polariton entanglement in semiconductor microcavities

Analysis of a continuous-variable quadripartite cluster state from a single optical parametric oscillator

Separated atomic ensembles: Multimode squeezed states and multipartite entangled states

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