Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Conference on Lasers and Electro-Optics

Mode-locked Phase Coherent Singly-Resonant Biphoton Frequency Comb

Kai-Chi Chang, Xiang Cheng, Murat Can Sarihan, Wenting Wang, Franco N. C. Wong, Jeffrey H. Shapiro, Chee Wei Wong

Published Jan 1, 2022• 1 citation
Publisher

Abstract

We observed evidence of spectral-phase-coherence in a singly-resonant biphoton frequency comb’s second-order cross-correlation function, and we verified the state’s time-energy entanglement by measuring Franson interference in 2 time-bins that violate the Bell inequality.
DOI
10.1364/cleo_qels.2022.fth5o.4

Related papers

Towards optimum Franson interference recurrence in mode-locked singly-filtered biphoton frequency combs

Kai-Chi Chang, Xiang Cheng, Murat Can Sarihan +1 more

Mode-locked biphoton frequency combs exhibit multiple discrete comblike temporal correlations from the Fourier transform of its phase-coherent frequency spectrum. Both temporal correlation and Franson interferometry are valuable tools for analyzing the joint properties of biphoton frequency combs, and the latter has proven to be essential for testing the fundamental quantum nature, the time-energy entanglement distribution, and the large-alphabet quantum key distributions. However, the Franson recurrence interference visibility in biphoton frequency combs unavoidably experiences a falloff that deteriorates the quality of time-energy entanglement and channel capacity for longer cavity round trips. In this paper, we provide a new method to address this problem towards optimum Franson interference recurrence. We first observe mode-locked temporal oscillations in a 5.03 GHz free-spectral range singly filtered biphoton frequency comb using only commercial detectors. Then, we observe similar falloff trend of time-energy entanglement in 15.15 GHz and 5.03 GHz free-spectral range singly filtered biphoton frequency combs, whereas, the optimum central time-bin accidental-subtracted visibility over 97% for both cavities. Here, we find that by increasing the cavity finesse F , we can enhance the detection probability in temporal correlations and towards optimum Franson interference recurrence in our singly filtered biphoton frequency combs. For the first time, via a higher cavity finesse F of 45.92 with a 15.11 GHz free-spectral range singly filtered biphoton frequency comb, we present an experimental ≈3.13-fold improvement of the Franson visibility compared to the Franson visibility with a cavity finesse F of 11.14 at the sixth time bin. Near optimum Franson interference recurrence and a time-bin Schmidt number near 16 effective modes in similar free-spectral range cavity are predicted with a finesse F of 200. Our configuration is versatile and robust against changes in cavity parameters that can be designed for various quantum applications, such as high-dimensional time-energy entanglement distributions, high-dimensional quantum key distributions, and wavelength-multiplexed quantum networks.

Photonics Research•Apr 21, 2023•22 citations

High-dimensional Energy-time Entanglement Distribution via a Biphoton Frequency Comb

Kai-Chi Chang, Xiang Cheng, Murat Can Sarihan +3 more

We report the first high-dimensional energy-time entanglement distribution with a singly-resonant biphoton frequency comb, demonstrating time-frequency Franson interferences with high visibility, and establishing a high-dimensional entanglement link.

Conference on Lasers and Electro-Optics•Jan 1, 2021•7 citations

Quantification of High-dimensional Energy-time Entanglement in a Biphoton Frequency Comb

Kai-Chi Chang, Xiang Cheng, Murat Can Sarihan +7 more

We quantify high-dimensional energy-time entanglement with a filtered biphoton frequency comb. Franson interference measurements are performed, with the entanglement of formation up to 1.89 ± 0.03 ebits for a 45.32 GHz biphoton frequency comb.

Conference on Lasers and Electro-Optics•Jan 1, 2021•0 citations

Demonstration of frequency-bin entanglement in an integrated optical microresonator

Poolad Imany, José A. Jaramillo-Villegas, Ogaga D. Odele +4 more

For the first time, we present a verification of frequency-bin entanglement and phase coherence of an on-chip biphoton frequency comb through a novel two-photon interference measurement scheme and the estimation of the density matrix.

Conference on Lasers and Electro-Optics•Jan 1, 2017•6 citations

Time-resolved detection of phase-coherent biphoton frequency combs from Si3N4 microring

Karthik V. Myilswamy, Mohammed S. Alshaykh, Hsuan‐Hao Lu +4 more

We generate a biphoton frequency comb from an integrated 40.4 GHz silicon nitride microring and probe the phase coherence through electro-optic mixing of the frequency bins followed by time-resolved detection of the time-correlation function.

Conference on Lasers and Electro-Optics•Jan 1, 2021•1 citation

High-Dimensional Time-Frequency Entanglement and Schmidt Number Witnesses Using a Biphoton Frequency Comb

Kai-Chi Chang, Xiang Cheng, Murat Can Sarihan +8 more

We demonstrated high-dimensional time-frequency entanglement with a mode-locked biphoton frequency comb. Hong-Ou-Mandel interference and joint spectral intensity measurements are performed, and we estimated Hilbert space dimensionality of at least 3481 via Schmidt mode decompositions.

Conference on Lasers and Electro-Optics•Jan 1, 2020•1 citation
Mode-locked biphoton frequency combs exhibit multiple discrete comblike temporal correlations from the Fourier transform of its phase-coherent frequency spectrum. Both temporal correlation and Franson interferometry are valuable tools for analyzing the joint properties of biphoton frequency combs, and the latter has proven to be essential for testing the fundamental quantum nature, the time-energy entanglement distribution, and the large-alphabet quantum key distributions. However, the Franson recurrence interference visibility in biphoton frequency combs unavoidably experiences a falloff that deteriorates the quality of time-energy entanglement and channel capacity for longer cavity round trips. In this paper, we provide a new method to address this problem towards optimum Franson interference recurrence. We first observe mode-locked temporal oscillations in a 5.03 GHz free-spectral range singly filtered biphoton frequency comb using only commercial detectors. Then, we observe similar falloff trend of time-energy entanglement in 15.15 GHz and 5.03 GHz free-spectral range singly filtered biphoton frequency combs, whereas, the optimum central time-bin accidental-subtracted visibility over 97% for both cavities. Here, we find that by increasing the cavity finesse F , we can enhance the detection probability in temporal correlations and towards optimum Franson interference recurrence in our singly filtered biphoton frequency combs. For the first time, via a higher cavity finesse F of 45.92 with a 15.11 GHz free-spectral range singly filtered biphoton frequency comb, we present an experimental ≈3.13-fold improvement of the Franson visibility compared to the Franson visibility with a cavity finesse F of 11.14 at the sixth time bin. Near optimum Franson interference recurrence and a time-bin Schmidt number near 16 effective modes in similar free-spectral range cavity are predicted with a finesse F of 200. Our configuration is versatile and robust against changes in cavity parameters that can be designed for various quantum applications, such as high-dimensional time-energy entanglement distributions, high-dimensional quantum key distributions, and wavelength-multiplexed quantum networks.