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36 papers · 2 filters
Dynamics of a Quantum Reference Frame
David Poulin, Jon Yard
We analyze a quantum mechanical gyroscope which is modeled as a large spin and used as a reference against which to measure the angular momenta of spin-1/2 particles. These measure…
On experimental procedures for entanglement verification
S. J. van Enk, N. Lutkenhaus, H. J. Kimble
We give an overview of different types of entanglement that can be generated in experiments, as well as of various protocols that can be used to verify or quantify entanglement. We…
Security of quantum key distribution using weak coherent states with nonrandom phases
Hoi-Kwong Lo, John Preskill
We prove the security of the Bennett-Brassard (BB84) quantum key distribution protocol in the case where the key information is encoded in the relative phase of a coherent-state re…
Subsystem fault tolerance with the Bacon-Shor code
Panos Aliferis, Andrew W. Cross
We discuss how the presence of gauge sub-systems in the Bacon-Shor code [D. Bacon, Phys. Rev. A 73, 012340 (2006)] leads to remarkably simple and efficient methods for fault-tolera…
N-representability is QMA-complete
Y. -K. Liu, M. Christandl, F. Verstraete
We study the computational complexity of the N-representability problem in quantum chemistry. We show that this problem is QMA-complete, which is the quantum generalization of NP-c…
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…