Complete quantum measurements break entanglement
Juha-Pekka Pellonp\"a\"a
TL;DR
Complete quantum measurements, which fully refine an observable, can completely break entanglement between a system, ancilla, and environment, impacting phenomena like the quantum Zeno effect and position measurements.
Contribution
This paper demonstrates that complete measurements can entirely break entanglement, revealing new insights into measurement-induced state changes in quantum systems.
Findings
Complete measurements break entanglement completely.
Implications for the quantum Zeno effect are discussed.
Effects on complete position measurements are analyzed.
Abstract
Complete measurement of a quantum observable (POVM) is a measurement of the maximally refined version of the POVM. Complete measurements give information on multiplicities of measurement outcomes and can be viewed as state preparation procedures. Moreover, any observable can be measured completely. In this Letter, we show that a complete measurement breaks entanglement completely between the system, ancilla and their environment. Finally, consequences to the quantum Zeno effect and complete position measurements are discussed.
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