Predetection squeezing as a resource for high-dimensional Bell-state measurements

Anno: 2025

Autori: Bianchi L., Marconi C., Sperling J., Bacco D.

Affiliazione autori: Univ Firenze, Dept Phys & Astron, I-50019 Florence, Italy; Ist Nazl Ott Consiglio Nazl Ric CNR INO, I-50125 Florence, Italy; Paderborn Univ, Inst Photon Quantum Syst PhoQS, Theoret Quantum Sci, Warburger Str 100, D-33098 Paderborn, Germany.

Abstract: Bell measurements, entailing the projection onto one of the Bell states, play a key role in quantum information and communication, where the outcome of a variety of protocols crucially depends on the success probability of such measurements. Although in the case of qubit systems, Bell measurements can be implemented using only linear optical components, the same result is no longer true for qudits, where at least the use of ancillary photons is required. In order to circumvent this limitation, one possibility is to introduce nonlinear effects. In this work, we adopt the latter approach and propose a scalable Bell measurement scheme for high-dimensional states, exploiting multiple squeezer devices applied to a linear optical circuit for discriminating the different Bell states. Our approach does not require ancillary photons, is not limited by the dimension of the quantum states, and is experimentally scalable, thus paving the way toward the realization of an effective high-dimensional Bell measurement.

Giornale/Rivista: PHYSICAL REVIEW RESEARCH

Volume: 7 (2)      Da Pagina: 23038-1  A: 23038-9

Maggiori informazioni: L.B. thanks Riccardo Cioli for useful comments and discussions. This research has been cofunded by the European Union, ERC StG, QOMUNE, Grant No. 101077917, and by the NextGeneration EU, Integrated Infrastructure Initiative in Photonic and Quantum Sciences, I-PHOQS (Grants No. IR0000016, No. ID D2B8D520, and No. CUP B53C22001750006) . J.S.acknowledges funding through the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via the transregional collaborative research center TRR 142 (Project C10, Grant No. 231447078) .
Parole chiavi: Quantum Teleportation; Entanglement
DOI: 10.1103/PhysRevResearch.7.023038