Gate sequence for continuous variable one-way quantum computation

Su, Xiaolong; Hao, Shuhong; Deng, Xiaowei; Ma, Lingyu; Wang, Meihong; Jia, Xiaojun; Xie, Changde; Peng, Kunchi

doi:10.1038/ncomms3828

Cited by 117 publications

(91 citation statements)

References 51 publications

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“…From application view point, the generated entangled state has potential in one-way continuous-variable (CV) quantum computation [41]. By forming a cluster of entangling gates, it is possible to implement CV quantum computation using our system.…”

Section: Exciton-mode-mechanical-mode Entanglementmentioning

confidence: 99%

“…By forming a cluster of entangling gates, it is possible to implement CV quantum computation using our system. The excitonmechanical mode entanglement might have advantages over that obtained between optical modes [41] due to the robustness of the entanglement as well as the availability of semiconductor and micro-electromechanical (MEMS) technologies. The exciton-mechanical mode entanglement also means entanglement with mechanical oscillator or MEMS, a significant progress towards entanglement of macroscopic objects.…”

Section: Exciton-mode-mechanical-mode Entanglementmentioning

confidence: 99%

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Entanglement between exciton and mechanical modes via dissipation-induced coupling

2015

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We analyze the entanglement between two matter modes in a hybrid quantum system consisting of a microcavity, a quantum well, and a mechanical oscillator. Although the exciton mode in the quantum well and the mechanical oscillator are initially uncoupled, their interaction through the microcavity field results in an indirect exciton-mode-mechanical-mode coupling. We show that this coupling is a Fano-Agarwal-type coupling induced by the decay of the exciton and the mechanical modes caused by the leakage of photons through the microcavity to the environment. Using experimental parameters and for slowly varying microcavity field, we show that the generated coupling leads to an exciton-mode-mechanical-mode entanglement. The maximum entanglement is achieved at the avoided level crossing frequency, where the hybridization of the two modes is maximum. The entanglement is also robust against the phonon thermal bath temperature.

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Section: Exciton-mode-mechanical-mode Entanglementmentioning

confidence: 99%

Section: Exciton-mode-mechanical-mode Entanglementmentioning

confidence: 99%

Entanglement between exciton and mechanical modes via dissipation-induced coupling

2015

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“…The cluster states that facilitate MBQC can be generated via linear optics [5][6][7][8]. Four-mode and six-mode cluster states have been already used to implement arbitrary single-mode Gaussian gates [9], a two-mode Gaussian gate [10], and a gate sequence of these two [11]. Reshaping a cluster state [12] is possible through quantum erasing [13] and wire-shortening [14], which correspond to erasing and preserving the interaction gains between the nodes of the cluster state, respectively.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of a fully tunable entangling gate for continuous-variable one-way quantum computation

Yokoyama¹,

Ukai²,

Armstrong³

et al. 2015

Phys. Rev. A

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We introduce a fully tuneable entangling gate for continuous-variable one-way quantum computation. We present a proof-of-principle demonstration by propagating two independent optical inputs through a three-mode linear cluster state and applying the gate in various regimes. The genuine quantum nature of the gate is confirmed by verifying the entanglement strength in the output state. Our protocol can be readily incorporated into efficient multi-mode interaction operations in the context of large-scale one-way quantum computation, as our tuning process is the generalisation of cluster state shaping.

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“…Cluster states, a type of multipartite entangled states, are basic quantum resources for one-way quantum computation [1,2]. Based on a prepared large scale cluster state, one-way quantum computation can be implemented by measurement and feedforward of the measured results [3][4][5][6]. It has been demonstrated that a local quantum network can be built by distributing a multipartite entangled state among quantum nodes [7][8][9][10].…”

mentioning

confidence: 99%

Quantum Entanglement Swapping between Two Multipartite Entangled States

Tian

Deng

et al. 2016

Phys. Rev. Lett.

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Quantum entanglement swapping is one of the most promising ways to realize the quantum connection among local quantum nodes. In this Letter, we present an experimental demonstration of the entanglement swapping between two independent multipartite entangled states, each of which involves a tripartite Greenberger-Horne-Zeilinger (GHZ) entangled state of an optical field. The entanglement swapping is implemented deterministically by means of a joint measurement on two optical modes coming from the two multipartite entangled states respectively and the classical feedforward of the measurement results. After entanglement swapping the two independent multipartite entangled states are merged into a large entangled state in which all unmeasured quantum modes are entangled. The entanglement swapping between a tripartite GHZ state and an Einstein-PodolskyRosen entangled state is also demonstrated and the dependence of the resultant entanglement on transmission loss is investigated. The presented experiment provides a feasible technical reference for constructing more complicated quantum networks.PACS numbers: 03.67. Hk, 03.67.Bg, 42.50.Ex, 42.50.Lc Multipartite entangled states play essential roles in quantum computation and quantum networks. Cluster states, a type of multipartite entangled states, are basic quantum resources for one-way quantum computation [1,2]. Based on a prepared large scale cluster state, one-way quantum computation can be implemented by measurement and feedforward of the measured results [3][4][5][6]. It has been demonstrated that a local quantum network can be built by distributing a multipartite entangled state among quantum nodes [7][8][9][10]. If we have two space-separated local quantum networks built by two independent multipartite entangled states, respectively, how can we establish entanglement between the quantum nodes in the two local quantum networks? It has been proposed that a large scale cluster state can be generated by the fusion of small scale cluster states, which is completed by means of linear optical elements [11]. The shaping of a larger cluster state to a smaller one according to the requirement for one-way quantum computation has been demonstrated [12]. Another feasible method of merging two multipartite entangled states into one larger multipartite entangled state is quantum entanglement swapping [13], which has been proposed to build a global quantum network of clocks that may allow the construction of a real-time single international time scale (world clock) with unprecedented stability and accuracy [14].Quantum teleportation enables transportation of an unknown quantum state to a remote station by using an entangled state as the quantum resource. Up to now, long distance quantum teleportation of single pho- * Electronic address: suxl@sxu.edu.cn † Electronic address: kcpeng@sxu.edu.cn tons over 100 km has been experimentally demonstrated [15][16][17]. Quantum entanglement swapping, which makes two independent quantum entangled states become entangled without direct int...

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Gate sequence for continuous variable one-way quantum computation

Cited by 117 publications

References 51 publications

Entanglement between exciton and mechanical modes via dissipation-induced coupling

Entanglement between exciton and mechanical modes via dissipation-induced coupling

Demonstration of a fully tunable entangling gate for continuous-variable one-way quantum computation

Quantum Entanglement Swapping between Two Multipartite Entangled States

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