Complete Frequency-Bin Bell Basis Synthesizer

Suparna Seshadri, Hsuan-Hao Lu, Daniel E. Leaird, Andrew M. Weiner, and Joseph M. Lukens

Phys. Rev. Lett. 129, 230505 – Published 2 December 2022

Abstract

We report the experimental generation of all four frequency-bin Bell states in a single versatile setup via successive pumping of spontaneous parametric down-conversion with single and dual spectral lines. Our scheme utilizes intensity modulation to control the pump configuration and offers turn-key generation of any desired Bell state using only off-the-shelf telecommunication equipment. We employ Bayesian inference to reconstruct the density matrices of the generated Bell states, finding fidelities $\geq 97 %$ for all cases. Additionally, we demonstrate the sensitivity of the frequency-bin Bell states to common-mode and differential-mode temporal delays traversed by the photons comprising the state—presenting the potential for either enhanced resolution or nonlocal sensing enabled by our complete Bell basis synthesizer.

Received 11 May 2022
Revised 8 August 2022
Accepted 27 October 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.230505

Physics Subject Headings (PhySH)

Entanglement production Quantum correlations in quantum information Quantum entanglement Quantum optics Quantum state engineering

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Suparna Seshadri ¹, Hsuan-Hao Lu ², Daniel E. Leaird ¹, Andrew M. Weiner ¹, and Joseph M. Lukens ^2,3,*

¹Elmore Family School of Electrical and Computer Engineering and Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, Indiana 47907, USA
²Quantum Information Science Section, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
³Research Technology Office, Arizona State University, Tempe, Arizona 85287, USA