Scientific Results

The entropic cost of quantum generalized measurements

Year: 2018

Authors: Mancino L., Sbroscia M., Roccia E., Gianani I., Somma F., Mataloni P., Paternostro M., Barbieri M.

Autors Affiliation: [Mancino, Luca; Sbroscia, Marco; Roccia, Emanuele; Gianani, Ilaria; Somma, Fabrizia; Barbieri, Marco] Univ Roma Tre, Dipartimento Sci, Via Vasca Navale 84, I-00146 Rome, Italy.
[Mataloni, Paolo] Univ Roma La Sapienza, Dipartimento Fis, Quantum Opt Grp, Piazzale Aldo Moro 5, I-00185 Rome, Italy.
[Paternostro, Mauro] Queens Univ Belfast, Sch Math & Phys, Ctr Theoret Atom Mol & Opt Phys, Belfast BT7 1NN, Antrim, North Ireland.
[Barbieri, Marco] CNR, Ist Nazl Ott, Largo E Fermi 6, I-50125 Florence, Italy.

Abstract: Landauer’s principle introduces a symmetry between computational and physical processes: erasure of information, a logically irreversible operation, must be underlain by an irreversible transformation dissipating energy. Monitoring micro-and nano-systems needs to enter into the energetic balance of their control; hence, finding the ultimate limits is instrumental to the development of future thermal machines operating at the quantum level. We report on the experimental investigation of a lower bound to the irreversible entropy associated to generalized quantum measurements on a quantum bit. We adopted a quantum photonics gate to implement a device interpolating from the weakly disturbing to the fully invasive and maximally informative regime. Our experiment prompted us to introduce a bound taking into account both the classical result of the measurement and the outcoming quantum state; unlike previous investigation, our entropic bound is based uniquely on measurable quantities. Our results highlight what insights the information-theoretic approach provides on building blocks of quantum information processors.

Journal/Review: NPJ QUANTUM INFORMATION

Volume: 4      Pages from: 20-1  to: 20-6

KeyWords: Maxwells demon; information; computation; principle; physics
DOI: 10.1038/s41534-018-0069-z

Citations: 9
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-10-17
References taken from IsiWeb of Knowledge: (subscribers only)
Connecting to view paper tab on IsiWeb: Click here
Connecting to view citations from IsiWeb: Click here

gdpr-image
This site uses cookies. If you decide to continue browsing we consider that you accept their use. For more information about cookies and how to delete them please read our Info Policy on cookies use.
Read more