Manipulating mesoscopic multipartite entanglement with atom-light interfaces

Stasińska, Julia; Rodó, Carles; Paganelli, Simone; Birkl, G.; Sanpera, Anna

doi:10.1103/physreva.80.062304

Cited by 12 publications

(31 citation statements)

References 32 publications

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“…Then for κ = 1 the remaining terms are exactly the nullifier relations, (22), for the four-mode square cluster state. To complete the protocol, homodyne measurements are made on the outgoing interaction pulses which project the ensembles into the required state.…”

Section: Multimode Composite Cluster Statesmentioning

confidence: 92%

“…Note that the momenta of the light and atomic modes now have the correct form as given by (22) for the quadrature combinations for a two mode cluster state plus some extra noise terms that are a consequence of the backaction of the QND interactions. To complete the protocol, the outgoing interaction pulses undergo homodyne measurements which project the composite system into a cluster state.…”

Section: A Composite Cluster Protocolmentioning

confidence: 99%

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Composite-cluster states and alternative architectures for one-way quantum computation

Milne

Korolkova²

2012

Phys. Rev. A

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We propose a new architecture for the measurement-based quantum computation model. The new design relies on small composite light-atom primary clusters. These are then assembled into cluster arrays using ancillary light modes and the actual computation is run on such a cellular cluster. We show how to create the primary clusters, which are Gaussian cluster states composed of both light and atomic modes. These are entangled via QND interactions and beamsplitters and the scheme is well described within the continuous-variable covariance matrix formalism.

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Section: Multimode Composite Cluster Statesmentioning

confidence: 92%

Section: A Composite Cluster Protocolmentioning

confidence: 99%

Composite-cluster states and alternative architectures for one-way quantum computation

Milne

Korolkova²

2012

Phys. Rev. A

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“…In previous proposals, the light beam after interacting with the atomic ensembles was measured, inducing entanglement between the different samples (see e.g. [4,17,32,33]). Here, we will have a closer look at the situation in which the light beam is not measured after the interaction.…”

Section: The Faraday Interactionmentioning

confidence: 99%

“…As shown in [4] its verification can be made feasible with the help of external magnetic fields applied to the ensembles. Nonetheless, it has been shown in [17] that entanglement verification without external magnetic fields is also possible if the light crosses through each sample at a given angle α i . In this setup, which we name 'geometrical', the incident angles play a critical role since they can be used to shape both quantitatively and qualitatively the entanglement between the atomic ensembles.…”

Section: Introductionmentioning

confidence: 99%

Beyond pure state entanglement for atomic ensembles

Stasińska

Paganelli²,

Sanpera³

2012

New J. Phys.

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We analyze multipartite entanglement between atomic ensembles within quantum matter-light interfaces. In our proposal, a polarized light beam crosses sequentially several polarized atomic ensembles impinging on each of them at a given angle α i . These angles are crucial parameters for shaping the entanglement since they are directly connected to the appropriate combinations of the collective atomic spins that are squeezed. We exploit such a scheme to go beyond the pure state paradigm proposing realistic experimental settings to address multipartite mixed state entanglement in continuous variables.

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“…Note that it is also possible to measure the combinations of conjugate [17]. Detecting combinations of these operators may enable generation of clusterlike and other states used for QIP [33,40].…”

mentioning

confidence: 99%

Multipartite Entangled Spatial Modes of Ultracold Atoms Generated and Controlled by Quantum Measurement

et al. 2015

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We show that the effect of measurement backaction results in the generation of multiple many-body spatial modes of ultracold atoms trapped in an optical lattice, when scattered light is detected. The multipartite mode entanglement properties and their nontrivial spatial overlap can be varied by tuning the optical geometry in a single setup. This can be used to engineer quantum states and dynamics of matter fields. We provide examples of multimode generalizations of parametric down-conversion, Dicke, and other states; investigate the entanglement properties of such states; and show how they can be transformed into a class of generalized squeezed states. Furthermore, we propose how these modes can be used to detect and measure entanglement in quantum gases. DOI: 10.1103/PhysRevLett.114.113604 PACS numbers: 42.50.Ct, 03.67.Bg, 03.75.Gg, 42.50.Dv Recently, the field of quantum gases [1,2] has grown considerably, due to the suitability of atomic systems for quantum simulation of a wide array of systems with origins in other fields, such as condensed matter and particle physics. Such systems also have use in entanglement and quantum information processing (QIP) [3]. Control is achieved by light fields, and there has been recent interest in the regime when the light exhibits decidedly quantum properties, thus uniting quantum optics with many-body physics (see Refs. [4,5] for reviews). This fully quantum regime enables one to go beyond standard questions of ultracold gases trapped in fixed classical potentials, thus broadening the field even further.Measurement backaction, the evolution of a state due to observation, is one of the primary manifestations of quantum mechanics. It was exploited in the breakthrough cavity QED experiments [6], where atoms were used as probes of quantum states of light. Intriguing Fock and Schrödinger cat states were prepared in a single cavity using quantum nondemolition (QND) methods. However, scaling to a large number of cavities provides an extreme challenge.In contrast, we consider a case where the roles of light and matter are reversed: Ultracold atoms are trapped in an optical lattice, and light is used as a global QND probe. Thus, the lattice sites represent the storage of multiple quantum states of matter fields, and the number of illuminated sites can be tuned from few to thousands, enabling scaling. We show how the quantum nature of light manifest in the measurement backaction can be used to establish a rich mode structure of the matter fields, with nontrivial delocalization over many sites and entanglement properties. These modes can be used for quantum state engineering, including multimode generalizations of parametric down-conversion (PDC) and Dicke states. We focus on the mode entanglement properties of these states, which exhibit genuine multipartite mode entanglement [7,8], and contrary to the entanglement inherent to the symmetrization of indistinguishable particles, may be extracted for use in QIP. In contrast to setups with atomic ensembles, we consider optical lattic...

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Manipulating mesoscopic multipartite entanglement with atom-light interfaces

Cited by 12 publications

References 32 publications

Composite-cluster states and alternative architectures for one-way quantum computation

Composite-cluster states and alternative architectures for one-way quantum computation

Beyond pure state entanglement for atomic ensembles

Multipartite Entangled Spatial Modes of Ultracold Atoms Generated and Controlled by Quantum Measurement

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