Infrastructure for the quantum internet

Lloyd, Seth; Shapiro, Jeffrey H.; Wong, Franco N. C.; Kumar, Prem; Shahriar, Selim M.; Yuen, Horace P.

doi:10.1145/1039111.1039118

Cited by 118 publications

(110 citation statements)

References 17 publications

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“…All previous analyses of the MIT-NU architecture [43,30,44], however, have employed a cold-cavity approach in which each optical cavity-that would hold an 87 Rb atom in the actual implementation-is regarded as empty, and the loading probability is calculated by determining the probability that the state of the intracavity photon fields at the end of a loading interval is the desired singlet state. In this chapter, we provide a hot-cavity loading analysis for the MIT-NU system.…”

Section: Mit-nu Hot-cavity Loadingmentioning

confidence: 99%

“…shows a schematic of this system: QM 1 and QM 2 are trapped rubidium atom quantum memories, each L 0 km away-in opposite directions-from a dual optical parametric amplifier (OPA) source. As the overall structure of this architecture and its preliminary performance analysis have been described in considerable detail elsewhere [43,30,44], in this section,…”

Section: Mit-nu Architecturementioning

confidence: 99%

“…Plugging (5.41) into (5.40), we find 43) where the averaging is taken over the phase-noise termsξ S (−t h ) andξ P (0). In order to perform the averaging in (5.43), we will rewrite the phase-noise terms in a normally-ordered form by introducing an annihilation operatorb, whose quadrature components are the Her-…”

Section: Kerr Nonlinearity Between a Single-photon Pulse And A Coherementioning

confidence: 99%

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Long-distance quantum communication with neutral atoms

Razavi

Shapiro

2005

SPIE Proceedings

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In this thesis, we develop quantitative performance analyses for a variety of quantum communication/computation systems that have the common feature of employing neutral atoms for storage/processing and photons for qubit transmission. For most of these systems, there is a lack of a precise performance analysis to enable a comparison between different scenarios from a top-level system standpoint. One main goal of this thesis is to fill that gap, thus providing quantum system designers with realistic estimates of system performance that can guide and inform the design process.For many applications in quantum communication and distributed quantum processing, we need to share, in advance, an entangled state between two parties. Thus, entanglement distribution is at the core of long-distance quantum communication systems. It not only includes generation and transmission of entangled states, but it also requires storing them for further processing purposes. Whereas the photons are the prime candidate for the former task, they are not appropriate for long-time storage and processing. Metastable levels in some alkali atoms, e.g., rubidium, are attractive venues for quantum storage. In this thesis, we study several basic quantum memory modules-all based on single trapped atoms in high-finesse optical cavities-and analytically evaluate how efficiently they can be loaded with (entangled) quantum states. We propose a non-adiabatic mechanism for driving offresonant Raman transitions that can be used in loading trapped-atom quantum memories. Our method is more flexible than its adiabatic counterpart in that it allows use of larger cavities and a larger class of driving sources.We also describe two proposed implementations for long-distance quantum communication-one that uses trapped atoms as quantum memories and another that employs atomic ensembles for quantum storage. We provide, for the first time, a detailed quantitative performance analysis of the latter system, which enables us to compare these two systems in terms of the fidelity and the throughput that they achieve for entanglement distribution, repeater operation, and quantum teleportation.Finally, we study quantum computing systems that use the cross-Kerr nonlinearity between single-photon qubits and a coherent mode of light. The coherent beam serves a mediating role in coupling two weak single-photon beams. We analytically study this structure using a continuous-time formalism for the cross-Kerr effect in optical fibers. Our results establish stringent conditions that must be fulfilled for the system's proper operation.

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Section: Mit-nu Hot-cavity Loadingmentioning

confidence: 99%

Section: Mit-nu Architecturementioning

confidence: 99%

Section: Kerr Nonlinearity Between a Single-photon Pulse And A Coherementioning

confidence: 99%

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Long-distance quantum communication with neutral atoms

Razavi

Shapiro

2005

SPIE Proceedings

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“…Researchers are striving to produce quantum communication technology for long-range transmission of quantum information and sharing of distributed quantum states [1][2][3]. Quantum information requires a network specialized for quantum communication.…”

Section: Introductionmentioning

confidence: 99%

Analysis of quantum network coding for realistic repeater networks

Satoh¹,

Ishizaki²,

Nagayama³

et al. 2016

Phys. Rev. A

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Quantum repeater networks have attracted attention for the implementation of long-distance and large-scale sharing of quantum states. Recently, researchers extended classical network coding, which is a technique for throughput enhancement, into quantum information. The utility of quantum network coding (QNC) has been shown under ideal conditions, but it has not been studied previously under conditions of noise and shortage of quantum resources. We analyzed QNC on a butterfly network, which can create end-to-end Bell pairs at twice the rate of the standard quantum network repeater approach. The joint fidelity of creating two Bell pairs has a small penalty for QNC relative to entanglement swapping. It will thus be useful when we care more about throughput than fidelity. We found that the output fidelity drops below 0.5 when the initial Bell pairs have fidelity F < 0.90, even with perfect local gates. Local gate errors have a larger impact on quantum network coding than on entanglement swapping.

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“…(d) It can be used to establish a quantum-link between two ensembles-and-cavity based quantum computers. The scheme proposed here thus offers a robust technique for realizing a quantum internet without using the single-atom and ultra-short cavity based approaches 8,9,10 . Before proceeding, we summarize briefly the notations for describing the LSIIB process 6 .…”

mentioning

confidence: 99%

Quantum communication and computing with atomic ensembles using a light-shift-imbalance-induced blockade

2007

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Recently, we have shown that for conditions under which the so-called light-shift imbalance induced blockade (LSIIB) occurs, the collective excitation of an ensemble of a multi-level atom can be treated as a closed two level system. In this paper, we describe how such a system can be used as a quantum bit (qubit) for quantum communication and quantum computing. Specifically, we show how to realize a C-NOT gate using the collective qubit and an easily accessible ring cavity, via an extension of the so-called Pellizzari scheme. We also describe how multiple, small-scale quantum computers realized using these qubits can be linked effectively for implementing a quantum internet. We describe the details of the energy levels and transitions in 87 Rb atom that could be used for implementing these schemes.

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Infrastructure for the quantum internet

Cited by 118 publications

References 17 publications

Long-distance quantum communication with neutral atoms

Long-distance quantum communication with neutral atoms

Analysis of quantum network coding for realistic repeater networks

Quantum communication and computing with atomic ensembles using a light-shift-imbalance-induced blockade

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