Quantum Benchmarks for Pure Single-Mode Gaussian States

Quantum parameter estimation using general single-mode Gaussian states

Geometric characterization of separability and entanglement in pure Gaussian states by single-mode unitary operations

Gerardo Adesso, Salvatore M. Giampaolo, and Fabrizio Illuminati* Dipartimento di Fisica “E. R. Caianiello,” Università degli Studi di Salerno, Via S. Allende, I-84081 Baronissi (SA), Salerno, Italy CNR-INFM Coherentia, Napoli, Italy; CNISM, Unità di Salerno, Salerno, Italy; and INFN, Sezione di Napoli-Gruppo Collegato di Salerno, Salerno, Italy Grup d’Informació Quàntica, Universitat Autónoma d...

Pure Gaussian states from quantum harmonic oscillator chains with a single local dissipative process

We study the preparation of entangled pure Gaussian states via reservoir engineering. In particular, we consider a chain consisting of (2א+ 1) quantum harmonic oscillators where the central oscillator of the chain is coupled to a single reservoir. We then completely parametrize the class of (2א+1)-mode pure Gaussian states that can be prepared by this type of quantum harmonic oscillator chain. ...

Three-mode Gaussian states in quantum information with continuous variables

The structural aspects of tripartite entanglement in three-mode Gaussian states of continuous variable systems have been studied in [Adesso G, Serafini A and Illuminati F 2006 Phys. Rev. A 73 032345]. Here we focus our attention on the usefulness of such states in the context of realistic processing of continuous-variable quantum information. We introduce and discuss in detail several examples ...

Heralded generation of ultrafast single photons in pure quantum States.

We present an experimental demonstration of heralded single photons prepared in pure quantum states from a parametric down-conversion source. It is shown that, through controlling the modal structure of the photon pair emission, one can generate pairs in factorable states and thence eliminate the need for spectral filters in multiple-source interference schemes. Indistinguishable heralded photo...