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8 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…
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…
Teleportation transfers only speakable quantum information
G. Chiribella, V. Giovannetti, L. Maccone +1
We show that a quantum clock cannot be teleported without prior synchronization between sender and receiver: every protocol using a finite amount of entanglement and an arbitrary n…
Errors in quantum optimal control and strategy for the search of easily implementable control pulses
Antonio Negretti, Rosario Fazio, Tommaso Calarco
We introduce a new approach to assess the error of control problems we aim to optimize. The method offers a strategy to define new control pulses that are not necessarily optimal b…
Memory effects in attenuation and amplification quantum processes
Cosmo Lupo, Vittorio Giovannetti, Stefano Mancini
With increasing communication rates via quantum channels, memory effects become unavoidable whenever the use rate of the channel is comparable to the typical relaxation time of the…