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- Center for Astrophysics Harvard & SmithsonianUS22 papers
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14 papers · 2 filters
Efficient classical simulation of the approximate quantum Fourier transform
Nadav Yoran, Anthony J. Short
We present a method for classically simulating quantum circuits based on the tensor contraction model of Markov and Shi (quant-ph/0511069). Using this method we are able to classic…
Photonic crystal fibre source of photon pairs for quantum information processing
Jeremie Fulconis, Olivier Alibart, Jeremy L. O'Brien +2
We demonstrate two key components for optical quantum information processing: a bright source of heralded single photons; and a bright source of entangled photon pairs. A pair of p…
Weak Fourier-Schur sampling, the hidden subgroup problem, and the quantum collision problem
Andrew M. Childs, Aram W. Harrow, Pawel Wocjan
Schur duality decomposes many copies of a quantum state into subspaces labeled by partitions, a decomposition with applications throughout quantum information theory. Here we consi…
State Discrimination with Post-Measurement Information
Manuel A. Ballester, Stephanie Wehner, Andreas Winter
We introduce a new state discrimination problem in which we are given additional information about the state after the measurement, or more generally, after a quantum memory bound…
Entanglement generation by Fock-state filtration
K. J. Resch, J. L. O'Brien, T. J. Weinhold +2
We demonstrate a Fock-state filter which is capable of preferentially blocking single photons over photon pairs. The large conditional nonlinearities are based on higher-order quan…
Low Cost and Compact Quantum Cryptography
J. L. Duligall, M. S. Godfrey, K. A. Harrison +2
We present the design of a novel free-space quantum cryptography system, complete with purpose-built software, that can operate in daylight conditions. The transmitter and receiver…