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19 papers · 2 filters
Random quantum codes from Gaussian ensembles and an uncertainty relation
Patrick Hayden, Peter W. Shor, Andreas Winter
Using random Gaussian vectors and an information-uncertainty relation, we give a proof that the coherent information is an achievable rate for entanglement transmission through a n…
Counterexamples to additivity of minimum output p-Renyi entropy for p close to 0
Toby Cubitt, Aram W. Harrow, Debbie Leung +2
Complementing recent progress on the additivity conjecture of quantum information theory, showing that the minimum output p-Renyi entropies of channels are not generally additive f…
Heralded generation of entanglement with coupled cavities
Jaeyoon Cho, Dimitris G. Angelakis, Sougato Bose
We propose a scheme to generate two-photon, two-atom, or atom-photon entangledstates with a coupled system of two cavities. In our scheme, two cavity photonsare exchanged by the di…
On the local and non-local content of bipartite qubit and qutrit correlations
Valerio Scarani
The local and non-local contents of non-local probability distributions are studied using the approach of Elitzur, Popescu and Rohrlich [Phys. Lett. A \textbf{162}, 25 (1992)]. Thi…
Steady state entanglement between hybrid light-matter qubits
Dimitris G. Angelakis, Stefano Mancini, Sougato Bose
We study the case of two polaritonic qubits localized in two separate cavities coupled by a fiber/additional cavity. We show that surprisingly enough, even a coherent classical pum…
Upper Bounds for the Security of two Distributed-Phase Reference Protocols of Quantum Cryptography (Coherent-One-Way and Differential-Phase-Shift)
Cyril Branciard, Nicolas Gisin, Valerio Scarani
The Differential-Phase-Shift (DPS) and the Coherent-One-Way (COW) are among the most practical protocols for quantum cryptography, and are therefore the object of fast-paced experi…