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- Institute of AstronomyRU26 papers
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43 papers · 1 filter
A quantum information-theoretic proof of the relation between Horn's problem and the Littlewood-Richardson coefficients
Matthias Christandl
Horn's problem asks for the conditions on sets of integers mu, nu and lambda that ensure the existence of Hermitian operators A, B and A+B with spectra mu, nu and lambda, respectiv…
Comparative Analysis of Control Strategies
Sonia G Schirmer, Peter J Pemberton-Ross, Xiaoting Wang
Different ways of modelling quantum control systems, formulating control problems and solving the resulting problems are considered and compared. In particular, we compare the perf…
The Computational Power of Symmetric Hamiltonians
Alastair Kay
The presence of symmetries, be they discrete or continuous, in a physical system typically leads to a reduction in the problem to be solved. Here we report that neither translation…
Complementarity of Private and Correctable Subsystems in Quantum Cryptography and Error Correction
Dennis Kretschmann, David W. Kribs, Robert W. Spekkens
We make an explicit connection between fundamental notions in quantum cryptography and quantum error correction. Error-correcting subsystems (and subspaces) for quantum channels ar…
Quantum key distribution using a triggered quantum dot source emitting near 1.3 microns
P. M. Intallura, M. B. Ward, O. Z. Karimov +5
We report the distribution of a cryptographic key, secure from photon number splitting attacks, over 35 km of optical fiber using single photons from an InAs quantum dot emitting ~…
Negativity and contextuality are equivalent notions of nonclassicality
Robert W. Spekkens
Two notions of nonclassicality that have been investigated intensively are: (i) negativity, that is, the need to posit negative values when representing quantum states by quasiprob…