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Publication - Professor Mark Thompson

    Silicon photonic processor of two-qubit entangling quantum logic

    Citation

    Santagati, R, Silverstone, JW, Strain, MJ, Sorel, M, Miki, S, Yamashita, T, Fujiwara, M, Sasaki, M, Terai, H, Tanner, MG, Natarajan, CM, Hadfield, RH, O'Brien, JL & Thompson, MG, 2017, ‘Silicon photonic processor of two-qubit entangling quantum logic’. Journal of Optics, vol 19.

    Abstract

    Entanglement is a fundamental property of quantum mechanics, and is a primary resource in quantum information systems. Its manipulation remains a central challenge in the development of quantum technology. In this work, we demonstrate a device which can generate, manipulate, and analyse two-qubit entangled states, using miniature and mass-manufacturable silicon photonics. By combining four photon-pair sources with a reconfigurable six-mode interferometer, embedding a switchable entangling gate, we generate two-qubit entangled states, manipulate their entanglement, and analyse them, all in the same silicon chip. Using quantum state tomography, we show how our source can produce a range of entangled and separable states, and how our switchable controlled-Z gate operates on them, entangling them or making them separable depending on its configuration.

    Full details in the University publications repository