Repeat-until-success quantum repeaters

Bruschi, David Edward; Barlow, Thomas M.; Razavi, Mohsen; Beige, Almut

doi:10.1103/physreva.90.032306

Cited by 21 publications

(19 citation statements)

References 36 publications

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“…Specifically, the state represented by a graph can be created by initializing all qubits to the state |+ = (|0 + |1 )/ √ 2 and successively performing CZ gates between all pairs of qubits connected by an edge of the graph. This work has attracted a great deal of attention [17][18][19][20][21] due to its advantages over atomicmemory based repeaters, notably the all-photonic construction that avoids coherence time limitations, the resilience against photon loss, and the elimination of longdistance heralding [16]. These attractive features position quantum repeaters, and consequently long-distance quantum communication, as near-term, much more readily feasible technology compared to quantum computing [19,22].…”

Section: Introductionmentioning

confidence: 99%

Deterministic Generation of All-Photonic Quantum Repeaters from Solid-State Emitters

2017

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Quantum repeaters are nodes in a quantum communication network that allow reliable transmission of entanglement over large distances. It was recently shown that highly entangled photons in so-called graph states can be used for all-photonic quantum repeaters, which require substantially fewer resources compared to atomic-memory-based repeaters. However, standard approaches to building multiphoton entangled states through pairwise probabilistic entanglement generation severely limit the size of the state that can be created. Here, we present a protocol for the deterministic generation of large photonic repeater states using quantum emitters such as semiconductor quantum dots and defect centers in solids. We show that arbitrarily large repeater states can be generated using only one emitter coupled to a single qubit, potentially reducing the necessary number of photon sources by many orders of magnitude. Our protocol includes a built-in redundancy, which makes it resilient to photon loss.

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Section: Introductionmentioning

confidence: 99%

Deterministic Generation of All-Photonic Quantum Repeaters from Solid-State Emitters

2017

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“…This approach presents the resilience against photon loss, and also avoids the coherence time limitations of quantum memories and the longdistance heralding requirement. These features have led to all-photonic quantum repeaters attracting much attention recently [25][26][27][28][29][30].…”

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confidence: 99%

Experimental quantum repeater without quantum memory

et al. 2019

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Quantum repeaters -important components of a scalable quantum internet -enable the entanglement to be distributed over long distances. The standard paradigm for a quantum repeater relies on a necessary demanding requirement of quantum memory. Despite significant progress, the limited performance of quantum memory makes practical quantum repeaters still a great challenge. Remarkably, a proposed allphotonic quantum repeater avoids the need for quantum memory by harnessing the graph states in the repeater nodes. Here we perform an experimental demonstration of an all-photonic quantum repeater using linear optics. By manipulating a 12-photon interferometer, we implement a 2×2 parallel all-photonic quantum repeater, and observe an 89% enhancement of entanglement-generation rate over the standard parallel entanglement swapping. These results open a new way towards designing repeaters with efficient single-photon sources and photonic graph states, and suggest that the all-photonic scheme represents an alternative path -parallel to that of matter-memory-based schemes -towards realizing practical quantum repeaters.Recent years have seen enormous interest in quantum communication driven by its remarkable features of secure communication [1], quantum teleportation [2] and distributed quantum computing [3]. Photons are considered to be the optimal medium for quantum communication because of their flying nature and compatibility with current telecommunications networks. However the maximum communication distance is currently severely limited by photon loss in quantum channels, such as optical fibres. One viable solution is to use satellites as relays to transmit photons over a free-space channel [4,5]. In fibre-based telecommunications networks, quantum repeaters are believed to be the most promising way to overcome the distance limit [6]. The standard paradigm for a quantum repeater [7,8] consists of three basic technologies namely entanglement swapping [9, 10], entanglement purification [11,12] and quantum memory [13][14][15]. Recently, significant progress has been made both theoretically [16][17][18] and experimentally [19][20][21]. However, the limited performance of current quantum memories [22] remains a major obstacle in realizing practical quantum repeaters unless there is a future experimental breakthrough.

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“…The first generation of quantum repeaters may rely on probabilistic approaches to BSMs, which can be implemented using linear optics devices [21][22][23][24]. These systems expect to cover moderately long distances up to around 1000 km without the need for purification.…”

Section: Introductionmentioning

confidence: 99%

Long-Distance Trust-Free Quantum Key Distribution

Piparo

Razavi

2015

IEEE J. Select. Topics Quantum Electron.

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The feasibility of trust-free long-haul quantum key distribution (QKD) is addressed. We combine measurement-device-independent QKD (MDI-QKD), as an access technology, with a quantum repeater setup, at the core of future quantum communication networks. This will provide a quantum link none of whose intermediary nodes need to be trusted, or, in our terminology, a trust-free QKD link. As the main figure of merit, we calculate the secret key generation rate when a particular probabilistic quantum repeater protocol is in use. We assume the users are equipped with imperfect single photon sources, which can possibly emit two single photons, or laser sources to implement decoy-state techniques. We consider apparatus imperfection, such as quantum efficiency and dark count of photodetectors, path loss of the channel, and writing and reading efficiencies of quantum memories. By optimizing different system parameters, we estimate the maximum distance over which users can share secret keys when a finite number of memories are employed in the repeater setup.

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Repeat-until-success quantum repeaters

Cited by 21 publications

References 36 publications

Deterministic Generation of All-Photonic Quantum Repeaters from Solid-State Emitters

Deterministic Generation of All-Photonic Quantum Repeaters from Solid-State Emitters

Experimental quantum repeater without quantum memory

Long-Distance Trust-Free Quantum Key Distribution

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