Information-thermodynamics of Quantum Generalized Measurements

Understand

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.