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Removing correlations in signals transmitted over a quantum memory channel
Cosmo Lupo, Laleh Memarzadeh, Stefano Mancini
We consider a model of bosonic memory channel, which induces correlations among the transmitted signals. The application of suitable unitary transformations at encoding and decodin…
Entanglement frustration in multimode Gaussian states
Cosmo Lupo, Stefano Mancini, Paolo Facchi +2
Bipartite entanglement between two parties of a composite quantum system can be quantified in terms of the purity of one party and there always exists a pure state of the total sys…
Stochastic resonance in Gaussian quantum channels
Cosmo Lupo, Stefano Mancini, Mark M. Wilde
We determine conditions for the presence of stochastic resonance in a lossy bosonic channel with a nonlinear, threshold decoding. The stochastic resonance effect occurs if and only…
Enhanced Quantum Communication via Optical Refocusing
Cosmo Lupo, Vittorio Giovannetti, Stefano Pirandola +2
We consider the problem of quantum communication mediated by an optical refocusing system, which is schematized as a thin lens with a finite pupil. This model captures the basic fe…
Quantifying the Performance of Quantum Codes
C. Cafaro, S. L'Innocente, C. Lupo +1
We study the properties of error correcting codes for noise models in the presence of asymmetries and/or correlations by means of the entanglement fidelity and the code entropy. Fi…