Mechanical cooling and squeezing using optimal control

Frederik Werner Isaksen*, Ulrik Lund Andersen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

61 Downloads (Pure)


A mechanical system can be optimally controlled through continuous measurements of its position followed by feedback. We revisit the complete formalism for predicting the performance of such a system without invoking the standard rotating-wave approximation and the adiabatic approximation. Using this formalism, we deduce both the conditional and unconditional states of a mechanical oscillator using the optimal control and feedback that leads to mechanical cooling and mechanical squeezing. We find large discrepancies between the exact solutions and the approximate solutions, stressing the importance of using the complete model. We also highlight the importance of distinguishing between the conditional and unconditional states by demonstrating that these two cannot coincide in a typical control scheme, even with infinite feedback strength.

Original languageEnglish
Article number023512
JournalPhysical Review A
Issue number2
Number of pages16
Publication statusPublished - 2023


Dive into the research topics of 'Mechanical cooling and squeezing using optimal control'. Together they form a unique fingerprint.

Cite this