Metrology with PT -Symmetric Cavities: Enhanced Sensitivity near the PT -Phase Transition

Zhong Peng Liu, Jing Zhang, Şahin Kaya Özdemir, Bo Peng, Hui Jing, Xin You Lü, Chun Wen Li, Lan Yang, Franco Nori, Yu Xi Liu

Research output: Contribution to journalArticlepeer-review

226 Scopus citations


We propose and analyze a new approach based on parity-time (PT) symmetric microcavities with balanced gain and loss to enhance the performance of cavity-assisted metrology. We identify the conditions under which PT-symmetric microcavities allow us to improve sensitivity beyond what is achievable in loss-only systems. We discuss the application of PT-symmetric microcavities to the detection of mechanical motion, and show that the sensitivity is significantly enhanced near the transition point from unbroken- to broken-PT regimes. Our results open a new direction for PT-symmetric physical systems and it may find use in ultrahigh precision metrology and sensing.

Original languageEnglish (US)
Article number110802
JournalPhysical review letters
Issue number11
StatePublished - Sep 7 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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