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6 papers · 2 filters
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 quantum mechanics of time travel through post-selected teleportation
Seth Lloyd, Lorenzo Maccone, Raul Garcia-Patron +2
This paper discusses the quantum mechanics of closed timelike curves (CTC) and of other potential methods for time travel. We analyze a specific proposal for such quantum time trav…
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…
Quantum Defragmentation Algorithm
Daniel Burgarth, Vittorio Giovannetti
In this addendum of our paper [D. Burgarth and V. Giovannetti, Phys. Rev. Lett. 99, 100501 (2007)] we prove that during the transformation that allows one to enforce control by rel…
Closed timelike curves via post-selection: theory and experimental demonstration
Seth Lloyd, Lorenzo Maccone, Raul Garcia-Patron +8
Closed timelike curves (CTCs) are trajectories in spacetime that effectively travel backwards in time: a test particle following a CTC can in principle interact with its former sel…