On Quantum Rainbows: Density Operator in the Frequency-Bin Representation for Entangled Twin-Photons Generated With Sub-Threshold Microcombs
Journal Article
·
· IEEE Journal of Selected Topics in Quantum Electronics
- University of Maryland, College Park, MD (United States); University of Maryland
- University of Maryland, College Park, MD (United States)
Kerr optical frequency combs are generated by pumping a high-Q integrated microresonator with a resonant laser. Below threshold, the pump laser field mediates the phenomenon of spontaneous four-wave mixing, where two pump photons are symmetrically up- and down-converted as twin photons that can be entangled across up to tens of eigenmodes in the spectral domain. While these room-temperature integrated photonic circuits are expected to play a central role in quantum technology, their high dimensionality and dissipative nature are a challenge for their theoretical description, therefore hindering the understanding of their properties and potential of performance. In this article, we develop a framework that permits to obtain an explicit solution for the density operator of quantum microcombs below threshold. Furthermore, this self-consistent theoretical description allows for their complete characterization, as well as for the analytical determination of various performance metrics such as fidelity, purity, and entropy.
- Research Organization:
- University of Maryland, College Park, MD (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0022123
- OSTI ID:
- 2526581
- Journal Information:
- IEEE Journal of Selected Topics in Quantum Electronics, Journal Name: IEEE Journal of Selected Topics in Quantum Electronics Journal Issue: 5 Vol. 30; ISSN 1077-260X
- Publisher:
- IEEE Lasers and Electro-optics SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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