Idler-free channel position finding

Jason L. Pereira, Leonardo Banchi, Quntao Zhuang, Stefano Pirandola

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Entanglement is a powerful tool for quantum sensing, and entangled states can greatly boost the discriminative power of protocols for quantum illumination, quantum metrology, or quantum reading. However, entangled state protocols generally require the retention of an idler state, to which the probes are entangled. Storing a quantum state is difficult and so technological limitations can make protocols requiring quantum memories impracticable. One alternative is idler-free protocols that utilize nonclassical sources but do not require any idler states to be stored. Here we apply such a protocol to the task of channel position finding. This involves finding a target channel in a sequence of background channels, and has many applications, including quantum sensing, quantum spectroscopy, and quantum reading.

Original languageEnglish (US)
Article number042614
JournalPhysical Review A
Issue number4
StatePublished - Apr 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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