Quantum-enhanced multiparameter estimation in multiarm interferometers

Year: 2016

Authors: Ciampini MA., Spagnolo N., Vitelli C., Pezze L., Smerzi A., Sciarrino F.

Autors Affiliation: Sapienza Univ Roma, Dipartimento Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy; INO CNR, QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy; LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy.

Abstract: Quantum metrology is the state-of-the-art measurement technology. It uses quantum resources to enhance the sensitivity of phase estimation over that achievable by classical physics. While single parameter estimation theory has been widely investigated, much less is known about the simultaneous estimation of multiple phases, which finds key applications in imaging and sensing. In this manuscript we provide conditions of useful particle (qudit) entanglement for multiphase estimation and adapt them to multiarm Mach-Zehnder interferometry. We theoretically discuss benchmark multimode Fock states containing useful qudit entanglement and overcoming the sensitivity of separable qudit states in three and four arm Mach-Zehnder-like interferometers – currently within the reach of integrated photonics technology.

Journal/Review: SCIENTIFIC REPORTS

Volume: 6      Pages from: 28881-1  to: 28881-8

More Information: This work was supported by ERC-Starting Grant 3D-QUEST (3D-Quantum Integrated Optical Simulation; grant agreement no. 307783, http://www.3dquest.eu), EU-STREP Project QIBEC and PRIN project Advanced Quantum Simulation and Metrology (AQUASIM). LP acknowledges financial support by MIUR through FIRB Project No. RBFR08H058.
KeyWords: Interference; Phase; Entanglement
DOI: 10.1038/srep28881

Citations: 86
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