Browsing by Author "Tame, Mark"

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    Citation Count: 28
    Deterministic local doubling of W states
    (Optical Soc Amer, 2016) Yesilyurt, Can; Bugu, Sinan; Ozaydin, Fatih; Altintas, Azmi Ali; Tame, Mark; Yang, Lan; Ozdemir, Sahin Kaya
    In large quantum systems, multipartite entanglement can be found in many inequivalent classes. Preparing states of arbitrary size in different classes is important for performing a wide range of quantum protocols. W states, in particular, constitute a class with a variety of quantum networking protocols. However, all known schemes for preparing polarization encoded photonic W states are probabilistic, with resource requirements increasing at least sub-exponentially. We propose a deterministic scheme for preparing W states of size of any power of 2, which requires no prior entanglement and can be performed locally. We introduce an all-optical setup that can efficiently double the size of W states of arbitrary size. Our scheme advances the use of W states in real-world quantum networks and could be extended to other physical systems. (C) 2016 Optical Society of America
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    Article
    Citation Count: 68
    Fusing multiple W states simultaneously with a Fredkin gate
    (Amer Physical Soc, 2014) Ozaydin, Fatih; Bugu, Sinan; Yesilyurt, Can; Altintas, Azmi Ali; Tame, Mark; Ozdemir, Sahin Kaya
    We propose an optical scheme to prepare large-scale entangled networks of W states. The scheme works by simultaneously fusing three polarization-encoded W states of arbitrary size via accessing only one qubit of each W state. It is composed of a Fredkin gate (controlled-swap gate), two fusion gates [as proposed in S. K. Ozdemir et al., New J. Phys. 13, 103003 (2011)], and an H-polarized ancilla photon. Starting with three n-qubit W states, the scheme prepares a new W state with 3(n - 1) qubits after postselection if both fusion gates operate successfully, i.e., a fourfold coincidence at the detectors. The proposed scheme reduces the cost of creating arbitrarily large W states considerably when compared to previously reported schemes.