Quantum repeaters using coherent-state communication

Loock, Peter van; Lütkenhaus, Norbert; Munro, William J.; Nemoto, Kae

doi:10.1103/physreva.78.062319

Cited by 102 publications

(146 citation statements)

References 40 publications

(63 reference statements)

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“…A protocol based on two-photon detections that uses spins in quantum dots as quantum memories was proposed by . The "hybrid quantum repeater" approach of (van Loock et al, 2006(van Loock et al, , 2008 that combines the transmission of coherent states with the use of individual quantum systems is also primarily motivated by solidstate systems.…”

Section: Other Approaches Towards Quantum Repeatersmentioning

confidence: 99%

Quantum repeaters based on atomic ensembles and linear optics

et al. 2011

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The distribution of quantum states over long distances is limited by photon loss. Straightforward amplification as in classical telecommunications is not an option in quantum communication because of the no-cloning theorem. This problem could be overcome by implementing quantum repeater protocols, which create long-distance entanglement from shorter-distance entanglement via entanglement swapping. Such protocols require the capacity to create entanglement in a heralded fashion, to store it in quantum memories, and to swap it. One attractive general strategy for realizing quantum repeaters is based on the use of atomic ensembles as quantum memories, in combination with linear optical techniques and photon counting to perform all required operations. Here we review the theoretical and experimental status quo of this very active field. We compare the potential of different approaches quantitatively, with a focus on the most immediate goal of outperforming the direct transmission of photons.

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Section: Other Approaches Towards Quantum Repeatersmentioning

confidence: 99%

Quantum repeaters based on atomic ensembles and linear optics

et al. 2011

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“…A promis-E-mail: mauricio.torres@physik.tu-darmstadt.de Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289, Germany ing approach towards these schemes is to require some compatibility with existing optical communication networks. The proposal of van Loock et al [7,8,9,10] is such an approach where the repeater scheme employs coherent multiphoton states. These proposals assume dispersive interaction between the atomic qubits and the single-mode of the radiation field.…”

Section: Introductionmentioning

confidence: 99%

Unambiguous atomic Bell measurement assisted by multiphoton states

2016

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We propose and theoretically investigate an unambiguous Bell measurement of atomic qubits assisted by multiphoton states. The atoms interact resonantly with the electromagnetic field inside two spatially separated optical cavities in a Ramsey-type interaction sequence. The qubit states are postselected by measuring the photonic states inside the resonators. We show that if one is able to project the photonic field onto two coherent states on opposite sites of phase space, an unambiguous Bell measurement can be implemented. Thus our proposal may provide a core element for future components of quantum information technology such as a quantum repeater based on coherent multiphoton states, atomic qubits and matter-field interaction.

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“…Instead of performing the usual homodyne detections in the swapping protocol, it can be advantageous to consider performing an unambiguous state discrimination measurement. This measurement can allow one to eliminate bit-flip errors, however it requires photon detectors [24]. Ideally, such a method could allow for long-distance qubit communication with high fidelity.…”

Section: Non-gaussianmentioning

confidence: 99%

Continuous-Variable Entanglement Swapping

Marshall

Weedbrook²

2015

Entropy

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We present a very brief overview of entanglement swapping as it relates to continuous-variable quantum information. The technical background required is discussed and the natural link to quantum teleportation is established before discussing the nature of Gaussian entanglement swapping. The limitations of Gaussian swapping are introduced, along with the general applications of swapping in the context of to quantum communication and entanglement distribution. In light of this, we briefly summarize a collection of entanglement swapping schemes which incorporate a non-Gaussian ingredient and the benefits of such schemes are noted. Finally, we motivate the need to further study and develop such schemes by highlighting requirements of a continuous-variable repeater.

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Quantum repeaters using coherent-state communication

Cited by 102 publications

References 40 publications

Quantum repeaters based on atomic ensembles and linear optics

Quantum repeaters based on atomic ensembles and linear optics

Unambiguous atomic Bell measurement assisted by multiphoton states

Continuous-Variable Entanglement Swapping

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