Centrone, F;
Tassi, C;
Barbieri, M;
Serafini, A;
(2018)
Reversibility and quantum coherence in one-dimensional quantum cellular automata.
Physical Review A
, 98
(1)
10.1103/PhysRevA.98.012105.
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Abstract
Quantum cellular automata are important tools in understanding quantum dynamics, thanks to their simple and effective list of rules. Here we consider a class of noisy, one-dimensional quantum cellular automata that allow one to shift from unitary dynamics to completely positive maps, investigating the evolution of coherence as well as the notion of reversibility in such a setting. To this aim, we associate an approximate reverse automaton to each noisy automaton, and assess its effect, and we define an irreversibility time based on the distance from the maximally mixed state, which is shown to be the only attractor of the automaton map in the presence of dephasing. Our analysis illustrates the interplay between unitary and noisy dynamics.
| Type: | Article |
|---|---|
| Title: | Reversibility and quantum coherence in one-dimensional quantum cellular automata |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevA.98.012105 |
| Publisher version: | https://doi.org/10.1103/PhysRevA.98.012105 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Optics, Physics, Atomic, Molecular & Chemical, Physics, WALKS, PHOTONS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10056515 |
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