Enhanced Resolution of Lossy Interferometry by Coherent Amplification of Single Photons

Year: 2010

Authors: Vitelli C., Spagnolo N., Toffoli L., Sciarrino F., De Martini F.

Autors Affiliation: Sapienza Univ Roma, Dipartimento Fis, I-00185 Rome, Italy; Consorzio Nazl Interuniv Sci Fis Materia, I-00185 Rome, Italy; Ist Nazl Ottica, I-50125 Florence, Italy; Accademia Nazl Lincei, I-00165 Rome, Italy.

Abstract: In the quantum sensing context most of the efforts to design novel quantum techniques of sensing have been constrained to idealized, noise-free scenarios, in which effects of environmental disturbances could be neglected. In this work, we propose to exploit optical parametric amplification to boost interferometry sensitivity in the presence of losses in a minimally invasive scenario. By performing the amplification process on the microscopic probe after the interaction with the sample, we can beat the losses’ detrimental effect on the phase measurement which affects the single-photon state after its interaction with the sample, and thus improve the achievable sensitivity.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 105 (11)      Pages from: 113602-1  to: 113602-4

More Information: We acknowledge support by the Futuro in Ricerca Project HYTEQ and Progetto d’Ateneo of Sapienza Universita di Roma.
KeyWords: Standard Quantum Limit; Parametric Amplification; States; Entanglement
DOI: 10.1103/PhysRevLett.105.113602

Citations: 24
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