New paper: Scalable boson-sampling with time-bin encoding using a loop-based architecture

Full text here. We present an architecture for arbitrarily scalable boson-sampling using two nested fiber loops. The architecture has fixed experimental complexity, irrespective of the size of the desired interferometer, whose scale is limited only by fiber and switch loss rates. The architecture employs time-bin encoding, whereby the incident photons form a pulse train, which […]

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Comment: Will boson-sampling ever disprove the Extended Church-Turing thesis?

Full text here. Boson-sampling is a highly simplified, but non-universal, approach to implementing optical quantum computation. It was shown by Aaronson & Arkhipov that this protocol cannot be efficiently classically simulated unless the polynomial hierarchy collapses, which would be a shocking result in computational complexity theory. Based on this, numerous authors have made the claim […]

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New paper: Boson sampling with photon-added coherent states

Full paper here. Boson sampling is a simple and experimentally viable model for non-universal linear optics quantum computing. Boson sampling has been shown to implement a classically hard algorithm when fed with single photons. This raises the question as to whether there are other quantum states of light that implement similarly computationally complex problems. We […]

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New paper: Self-avoiding quantum walks

Full paper here. Quantum walks exhibit many unique characteristics compared to classical random walks. In the classical setting, self-avoiding random walks have been studied as a variation on the usual classical random walk. Classical self-avoiding random walks have found numerous applications, most notably in the modeling of protein folding. We consider the analogous problem in […]

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New paper: Quantum random walks on congested lattices

Full paper here. We consider quantum random walks on congested lattices and contrast them to classical random walks. Congestion is modelled with lattices that contain static defects which reverse the walker’s direction. We implement a dephasing process after each step which allows us to smoothly interpolate between classical and quantum random walkers as well as […]

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New paper: Sampling generalized cat states with linear optics is probably hard

Full paper here. Boson-sampling has been presented as a simplified model for linear optics quantum computing. In the boson-sampling model, Fock states are passed through a linear optics network and sampled via number-resolved photodetection. It has been shown that this sampling problem likely cannot be efficiently classically simulated. This raises the question as to whether […]

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Video blog: The liberal who didn’t vote Liberal

My thoughts on the recent Australian federal election, and my reasons for not voting Liberal.

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New paper: Spontaneous parametric down-conversion photon sources are scalable in the asymptotic limit for boson-sampling

Full paper here. Boson-sampling has emerged as a promising avenue towards post-classical optical quantum computation, and numerous elementary demonstrations have recently been performed. Spontaneous parametric down-conversion is the mainstay for single-photon state preparation, the technique employed in most optical quantum information processing implementations to-date. Here we present a simple architecture for boson-sampling based on multiplexed […]

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My second attempt at stand-up comedy

Live at the Stazione Espesso Bar, Sydney.

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Peter Rohde
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