Programmable four-photon graph states on a silicon chip

Adcock, Jeremy C.; Vigliar, Caterina; Santagati, Raffaele; Silverstone, Joshua W.; Thompson, Mark G.

doi:10.1038/s41467-019-11489-y

Cited by 107 publications

(71 citation statements)

References 45 publications

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“…The on-chip GMM of four-photon four-qubit graph states was demonstrated in a Si-chip ( Fig. 4f) [87]. The device includes four waveguide SFWM-SPSs creating two-pairs of photons and a reconfigurable two-qubit linear-optic operator.…”

Section: On-chip Quantum Information Processing With Photonsmentioning

confidence: 99%

Integrated photonic quantum technologies

et al. 2019

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Generations of technologies with fundamentally new information processing capabilities will emerge if microscopic physical systems can be controlled to encode, transmit, and process quantum information, at scale and with high fidelity. In the decade after its 2008 inception, the technology of integrated quantum photonics enabled the generation, processing, and detection of quantum states of light, at a steadily increasing scale and level of complexity. Using both established and advanced fabrication techniques, the field progressed from the demonstrations of fixed circuits comprising few components and operating on two photons, to programmable circuitry approaching 1000 components with integrated generation of multi-photon states. A continuation in this trend over the next decade would usher in a versatile platform for future quantum technologies. This Review summarises the advances in integrated photonic quantum technologies (materials, devices, and functionality), and its demonstrated on-chip applications including secure quantum communications, simulations of quantum physical and chemical systems, Boson sampling, and linear-optic quantum information processing.

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Section: On-chip Quantum Information Processing With Photonsmentioning

confidence: 99%

Integrated photonic quantum technologies

et al. 2019

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“…Considerable experimental effort [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] is being dedicated to the realization of linear optical quantum computation [19,20] due to the extensive coherence times that photonic qubits promise. To support this endeavor, we must design robust models of fault-tolerant quantum computation that minimize the high resource cost that is demanded by their implementation.…”

Section: Introductionmentioning

confidence: 99%

Universal fault-tolerant measurement-based quantum computation

Brown

Roberts

2020

Phys. Rev. Research

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Certain physical systems that one might consider for fault-tolerant quantum computing where qubits do not readily interact, for instance photons, are better suited for measurement-based quantum-computational protocols. Here we propose a measurement-based model for universal quantum computation that simulates the braiding and fusion of Majorana modes. To derive our model we develop a general framework that maps any scheme of fault-tolerant quantum computation with stabilizer codes into the measurement-based picture. As such, our framework gives an explicit way of producing fault-tolerant models of universal quantum computation with linear optics using any protocol developed using the stabilizer formalism. Given the remarkable fault-tolerant properties that Majorana modes promise, the main example we present offers a robust and resource-efficient proposal for photonic quantum computation.

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“…Different from the interference which occurs in the BosonSampling experiments with linear optics, the underlying effect in our crystal network is multiphotonic frustrated photon generation. It would be exciting to see an actual implementation in a laboratory -potentially in integrated platforms which allow for on-chip photon pair generation [61][62][63][64][65][66][67][68]. While we have shown that the expected n-fold coincidence counts will be larger than in conventional Boson-Sampling systems, an important question is how these systems compete under realistic experimental situations.…”

Section: Graphical Description For Quantum Protocolsmentioning

confidence: 92%

Quantum experiments and graphs II: Quantum interference, computation, and state generation

Erhard

Zeilinger

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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We present a conceptually new approach to describe state-of-the-art photonic quantum experiments using Graph Theory. There, the quantum states are given by the coherent superpositions of perfect matchings. The crucial observation is that introducing complex weights in graphs naturally leads to quantum interference. The new viewpoint immediately leads to many interesting results, some of which we present here. Firstly, we identify a new and experimentally completely unexplored multiphoton interference phenomenon. Secondly, we find that computing the results of such experiments is #P-hard, which means it is a classically intractable problem dealing with the computation of a matrix function Permanent and its generalization Hafnian. Thirdly, we explain how a recent no-go result applies generally to linear optical quantum experiments, thus revealing important insights to quantum state generation with current photonic technology. Fourthly, we show how to describe quantum protocols such as entanglement swapping in a graphical way. The uncovered bridge between quantum experiments and Graph Theory offers a novel perspective on a widely used technology, and immediately raises many follow-up questions.

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Programmable four-photon graph states on a silicon chip

Cited by 107 publications

References 45 publications

Integrated photonic quantum technologies

Integrated photonic quantum technologies

Universal fault-tolerant measurement-based quantum computation

Quantum experiments and graphs II: Quantum interference, computation, and state generation

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