Berlin 2014 – wissenschaftliches Programm
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SYQS: Symposium Characterization and control of complex quantum systems
SYQS 1: Characterization and control of complex quantum systems I
SYQS 1.2: Hauptvortrag
Freitag, 21. März 2014, 11:30–12:00, Audimax
Multiphoton random walks: Experimental Boson Sampling on a photonic chip — •Ian Walmsley1, Justin Spring1, Ben Metcalf1, Peter Humphreys1, Steve Kolthammer1, Xianmin Jin1, Animesh Datta1, James Gates2, and Peter Smith2 — 1University of Oxford, Department of Physics, Clarendon Laboratory, Parks Rd. Oxford, OX2 3PU, UK — 2Optoelectronics Research Center, University of Southampton, SO17 1BJ, UK
Photonics provides a feasible platform for implementing many quantum information protocols, with the opportunity to realise quantum enhancements to technologies from sensing to computation. For instance, ideal universal quantum computers may be exponentially more efficiently than classical machines for certain classes of problems. Nonetheless, the formidable challenges in building such a device motivate the search for and demonstration of alternative problems that still promise a quantum speedup. Quantum boson sampling (QBS) provides such an example. We have constructed a photonic quantum boson sampling machine (QBSM) to sample the output distribution resulting from the nonclassical interference of photons in an integrated photonic circuit, a problem thought to be exponentially hard to solve classically. Unlike universal quantum computation, boson sampling merely requires indistinguishable bosons, linear state evolution, and detectors, imperfections of which may result in systematic errors. Our studies open the way to larger devices that could offer the first definitive quantum enhanced computation.