The entropic cost of quantum generalized measurements

Luca Mancino, Marco Sbroscia, Emanuele Roccia, Ilaria Gianani, Fabrizia Somma, Paolo Mataloni, Mauro Paternostro, Marco Barbieri

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
213 Downloads (Pure)


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 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 new entropic bound is based uniquely on measurable quantities. Our results highlight what insights the information-theoretic approach can provide on building blocks of quantum information processors.
Original languageEnglish
Pages (from-to)1-6
Journalnpj Quantum Information
Issue number20
Publication statusPublished - 13 Mar 2018


  • quant-ph


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