Toward quantum networking with frequency-bin qudits

Conference · Fri Mar 01 04:00:00 EST 2024

DOI:https://doi.org/10.1117/12.3008755· OSTI ID:2333797

Myilswamy, Karthik V. ^[1]; Seshadri, Suparna ^[1]; Lu, Hsuan-Hao ^[2]; Liu, Junqiu ^[3]; Kippenberg, Tobias ^[3]; Lukens, Joseph ^[4]; Lukens, Joseph ^[2]; Weiner, Andrew M. ^[1]

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1. Purdue University
2. ORNL
3. Ecole Polytechnique Federale de Lausanne (EPFL), Switzerland
4. Arizona State University

Quantum networking holds tremendous promise in transforming computation and communication. Entangled-photon sources are critical for quantum repeaters and networking, while photonic integrated circuits are vital for miniaturization and scalability. In this talk, we focus on generating and manipulating frequency-bin entangled states within integrated platforms. We encode quantum information as a coherent superposition of multiple optical frequencies; this approach is favorable due to its amenability to high-dimensional entanglement and compatibility with fiber transmission. We successfully generate and measure the density matrix of biphoton frequency combs from integrated silicon nitride microrings, fully reconstructing the state in an 8 × 8 two-qudit Hilbert space, the highest so far for frequency bins. Moreover, we employ Vernier electro-optic phase modulation methods to perform time-resolved measurements of biphoton correlation functions. Currently, we are exploring bidirectional pumping of microrings to generate indistinguishable entangled pairs in both directions, aiming to demonstrate key networking operations such as entanglement swapping and Greenberger–Horne–Zeilinger state generation in the frequency domain.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 2333797
• Country of Publication: United States
• Language: English