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13 papers · 2 filters
Generation of entangled photon pairs in optical cavity-QED: Operating in the bad cavity limit
R. García-Maraver, K. Eckert, R. Corbalán +1
We propose an optical cavity-QED scheme for the deterministic generation of polarization entangled photon pairs that operates with high fidelity even in the bad cavity limit. The s…
Distinguishability measures between ensembles of quantum states
Ognyan Oreshkov, John Calsamiglia
A quantum ensemble is a set of quantum states each occurring randomly with a given probability. Quantum ensembles are necessary to describe situations with incompl…
Positive maps, majorization, entropic inequalities, and detection of entanglement
Remigiusz Augusiak, Julia Stasińska
In this paper, we discuss some general connections between the notions of positive map, weak majorization and entropic inequalities in the context of detection of entanglement amon…
Phase estimation for thermal Gaussian states
M. Aspachs, J. Calsamiglia, R. Munoz-Tapia +1
We give the optimal bounds on the phase-estimation precision for mixed Gaussian states in the single-copy and many-copy regimes. Specifically, we focus on displaced thermal and squ…
Preparation of Decoherence Free Cluster States with Optical Superlattices
Liang Jiang, Ana Maria Rey, Oriol Romero-Isart +3
We present a protocol to prepare decoherence free cluster states using ultracold atoms loaded in a two dimensional superlattice. The superlattice geometry leads to an array of 2*2…
Phase-Covariant Quantum Benchmarks
J. Calsamiglia, M. Aspachs, R. Munoz-Tapia +1
We give a quantum benchmark for teleportation and quantum storage experiments suited for pure and mixed test states. The benchmark is based on the average fidelity over a family of…