Fundamental energy cost for quantum measurement

• DOI: 10.48550/arxiv.1609.06981
• Publication Date: 2016-01-01
• Authors: Kais Abdelkhalek; Yoshifumi Nakata; David Reeb
• Keywords: Quantum Measurement

Measurements and feedback are essential in the control of any device operating at quantum scale exploiting features physics. As number components grows, it becomes imperative to consider energetic expense such elementary operations. Here, we derive energy requirements for general measurement, extending previous models obtaining stronger bounds relevant situations, then study two important classes measurements detail. One is projective where obtain exact cost rather than a lower bound, other so-called inefficient which explicitly show that extraction possible. applications, energy-precision trade-off Zeno stabilisation schemes error correction. Our results constitute fundamental limitations against benchmark implementations future devices as they grow complexity.