—An important practical open question has been to design explicit, structured optical receivers that achieve the Holevo limit in the contexts of optical communication and " quantum reading. " The Holevo limit is an achievable rate that is higher than the Shannon limit of any known optical receiver. We demonstrate how a sequential decoding approach can… (More)
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Encryption schemes often derive their power from the properties of the underlying algebra on the symbols used. Inspired by group theoretic tools, we use the centralizer of the group of unitary operations to present a private-key quantum homomorphic encryption scheme that hides arbitrary quantum computations. A particular instance of our encoding hides… (More)
Encryption schemes often derive their power from the properties of the underlying algebra on the symbols used. Inspired by group theoretic tools, we use the centralizer of a subgroup of operations to present a private-key quantum homomorphic encryption scheme that enables a broad class of quantum computation on encrypted data. The quantum data is encoded on… (More)
We derive the quantum limit on the error probability exponent for discriminating any M multimode coherent states of light and show that it is four times that of an ideal heterodyne receiver for the same signal set. We then propose a receiver that achieves the quantum limit using auxiliary coherent-state fields, beam splitters, and single-photon detectors.… (More)
This work explores the problem of distinguishing potentially interesting new exotic states in QCD from conventional scattering states using lattice QCD, and addresses the specific case of the search for localized resonances in a system of five quarks. We employ a complete basis of local interpolating operators, as well as a number of spatially distributed… (More)