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- Mark Simon Tame, Bryn A. Bell, Carlo Di Franco, William J. Wadsworth, John G. Rarity
- Physical review letters
- 2014

We report an experimental demonstration of a one-way implementation of a quantum algorithm solving Simon's problem-a black-box period-finding problem that has an exponential gap between the classical and quantum runtime. Using an all-optical setup and modifying the bases of single-qubit measurements on a five-qubit cluster state, key representativeâ€¦ (More)

- Alex S. Clark, Bryn A. Bell, +6 authors John G. Rarity
- 2011

In this paper, we study the tailoring of photon spectral properties generated by four-wave mixing in a birefringent photonic crystal fibre (PCF). The aim is to produce intrinsically narrow-band photons and hence to achieve high non-classical interference visibility and generate high-fidelity entanglement without any requirement for spectral filtering,â€¦ (More)

- Bryn A. Bell, David A. Herrera-MartÃ, Mark Simon Tame, Deborah Markham, William J. Wadsworth, John G. Rarity
- Nature communications
- 2014

Scalable quantum computing and communication requires the protection of quantum information from the detrimental effects of decoherence and noise. Previous work tackling this problem has relied on the original circuit model for quantum computing. However, recently a family of entangled resources known as graph states has emerged as a versatile alternativeâ€¦ (More)

We report the characterization of a universal set of logic gates for one-way quantum computing using a four-photon â€˜starâ€™ cluster state generated by fusing photons from two independent photonic crystal fibre sources. We obtain a fidelity for the cluster state of 0.66Â± 0.01 with respect to the ideal case. We perform quantum process tomography to completelyâ€¦ (More)

- A. R. McMillan, Laurent Labonte, +6 authors J. G. Rarity
- Scientific reports
- 2013

Quantum networks involve entanglement sharing between multiple users. Ideally, any two users would be able to connect regardless of the type of photon source they employ, provided they fulfill the requirements for two-photon interference. From a theoretical perspective, photons coming from different origins can interfere with a perfect visibility, providedâ€¦ (More)

- Bryn A. Bell, Srikanth Kannan, Alex R. McMillan, Alex S. Clark, William J. Wadsworth, John G. Rarity
- Physical review letters
- 2013

Entangled photons can be used to make measurements with an accuracy beyond that possible with classical light. While most implementations of quantum metrology have used states made up of a single color of photons, we show that entangled states of two colors can show supersensitivity to optical phase and path length by using a photonic crystal fiber sourceâ€¦ (More)

- Xiang Zhang, Runyu Jiang, +4 authors Stephan Reitzenstein
- 2016

Practical quantum photonic applications require on-demand single photon sources. As one possible solution, active temporal and wavelength multiplexing has been proposed to build an on-demand single photon source. In this scheme, heralded single photons are generated from different pump wavelengths in many temporal modes. However, the indistinguishability ofâ€¦ (More)

- J. G. Rarity, Bryn A. Bell, Will McCutcheon, A. B. Young, C. Y. Hu
- 2013 Conference on Lasers & Electro-Optics Europeâ€¦
- 2013

To illustrate the loss problem I take the example of quantum metrology where for interferometric measurement of an optical phase θ, the fundamental limit or the standard quantum limit (SQL) Δθ ≥ 1/√n where n is the number of photons detected. In theory using entangled photons it is possible to beat the SQL and achieve theâ€¦ (More)

- Will McCutcheon, Antigoni Pappa, +9 authors Mark Simon Tame
- Nature communications
- 2016

Multipartite entangled states are a fundamental resource for a wide range of quantum information processing tasks. In particular, in quantum networks, it is essential for the parties involved to be able to verify if entanglement is present before they carry out a given distributed task. Here we design and experimentally demonstrate a protocol that allowsâ€¦ (More)

- Srikanth Kannan, Bryn A. Bell, Alex S. Clark, William J. Wadsworth, John G. Rarity
- 2011 Conference on Lasers and Electro-Opticsâ€¦
- 2011

Measurement, whilst being physically fundamental, is also fundamentally physical. Classical interferometric measurements suffer from physical limitations where the shot noise limit forms an upper bound of √n on a phase shift Δφ that can be resolved, with n being the average number of photons detected, making their applicability inâ€¦ (More)