Published in Nature Photonics: Experimental three-photon quantum nonlocality under strict locality conditions

Quantum mechanics implies properties of Nature that clash with our intuitive notions of how the universe ought to work. Testing these properties (to see if quantum mechanics is, indeed, true) involves generating entangled quantum states of two or more particles and measuring them under a number of strict conditions. While work is progressing to meet all of these conditions when using only two particles, no one has yet met even one of these conditions for more than two particles, which is considerably more difficult experimentally. Here, we conduct an experiment where we meet two of the most challenging conditions—namely measurement locality and freedom of choice—while generating triplet entangled photon states. We demonstrate that quantum mechanics wins out over intuition, measuring a violation of Mermin's inequality outside the classical bound by nine standard deviations.

C. Erven, E. Meyer-Scott, K. Fisher, J. Lavoie, B. L. Higgins, Z. Yan, C. J …

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Published in Optics Express: Generating polarization-entangled photon pairs using cross-spliced birefringent fibers

Generating entangled photon states is vital for numerous quantum communications and quantum computation primitives. Here we pioneer a new approach to in-fiber generation of entangled photon pairs. We take inspiration from a technique in bulk-optics, where two nonlinear crystals are sandwiched close together, and splice two pieces of birefringent optical fiber together at 90 degree orientation. With suitable compensation optics, all of which could be implemented in fiber, we show fidelity with a maximally-entangled Bell state of better than 92%.

E. Meyer-Scott, V. Roy, J.-P. Bourgoin, B. L. Higgins, L. K. Shalm, and T. Jennewein
Optics Express 21, 6205–12 (2013)

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Published in Journal of Lightwave Technology: Novel high-speed polarization source for decoy-state BB84 quantum key distribution over free space and satellite links

Here we detail our work on optoelectronics implementing a high-speed high-fidelity source of optical quantum states for quantum encryption.

Z. Yan, E. Meyer-Scott, J.-P. Bourgoin, B. L. Higgins, N. Gigov, A. MacDonald, H. Hübel, and T. Jennewein
J. Lightwave Tech. 31, 1399–408 (2013)

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Published in New Journal of Physics: A comprehensive design and performance analysis of low Earth orbit satellite quantum communication

We perform a thorough theoretical analysis of the expected key rate, success of Bell test, and teleportation distance of experiments performed between the ground and a satellite in low Earth orbit. Our findings demonstrate that successful, regularly repeatable demonstrations are feasible with current technologies and relatively small telescopes.

J.-P. Bourgoin, E. Meyer-Scott, B. L. Higgins, B. Helou, C. Erven, H. Hübel, B. Kumar, D. Hudson, I. D'Souza, R. Girard, R. Laflamme, and T. Jennewein
New J. Phys. 15, 023006 (2013)

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Published in Classical and Quantum Gravity: Fundamental quantum optics experiments conceivable with satellites

An ensemble cast detail the new physics that could be explored by taking quantum optics experiments into space. My first publication as part of Prof. Thomas Jennewein's group, I contributed details about near-term tests and our present work at the Institute for Quantum Computing, and helped out with logistics and proofing.

D. Rideout, T. Jennewein, G. Amelino-Camelia, T. F. Demarie, B. L. Higgins, A. Kempf, A. Kent, R. Laflamme, X. Ma, R. B. Mann, E. Martin-Martinez, N. C. Menicucci, J. Moffat, C. Simon, R. Sorkin, L. Smolin, and D. R. Terno
Class. Quantum Grav. 29, 224011 (2012)

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Published in Physical Review A: Multiple-copy state discrimination: Thinking globally, acting locally

Following on from our prior paper, here we take a closer theoretical look at the different measurement approaches one can use to discriminate between nonorthogonal quantum states when given multiple copies. We examine the behaviour of these schemes in both limits of moderate number of copies and as the number of copies tends towards infinity (the latter of which took quite a long time to determine for the overall optimal scheme), and we identify the quantum mixture regimes in which certain measurements become the same. Indeed, we show that for more than 2% mixture and a large number of copies, the naive measurement strategy is as good as any other.

B. L. Higgins, A. C. Doherty, S. D. Bartlett, G. J. Pryde, and H. M. Wiseman
Phys. Rev. A 83, 052314 (2011)

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