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13 papers · 2 filters
Achieving the Holevo bound via sequential measurements
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone
We present a new decoding procedure to transmit classical information in a quantum channel which, saturating asymptotically the Holevo bound, achieves the optimal rate of the commu…
Ground state factorization and correlations with broken symmetry
Bruno Tomasello, Davide Rossini, Alioscia Hamma +1
We show how the phenomenon of factorization in a quantum many body system is of collective nature. To this aim we study the quantum discord in the one dimensional XY model in a…
Cross-Phase Modulation and Population Redistribution in a Periodic Tripod Medium
K. Slowik, A. Raczynski, J. Zaremba +3
The cross-Kerr effect is studied for two pulses propagating in an atomic medium in a tripod configuration, dressed by a strong standing wave coupling beam. Nonlinear phase shifts f…
Sequential projective measurements for channel decoding
Seth Lloyd, Vittorio Giovannetti, Lorenzo Maccone
We study the transmission of classical information in quantum channels. We present a decoding procedure that is very simple but still achieves the channel capacity. It is used to g…
Interaction between hopping and static spins in a discrete network
Francesco Ciccarello
We consider a process where a spin hops across a discrete network and at certain sites couples to static spins. While this setting is implementable in various scenarios (e.g quantu…
The optimal unitary dilation for bosonic Gaussian channels
Filippo Caruso, Jens Eisert, Vittorio Giovannetti +1
A generic quantum channel can be represented in terms of a unitary interaction between the information-carrying system and a noisy environment. Here, the minimal number of quantum…