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

Latin America Optics and Photonics Conference

On-Chip Frequency Comb of Entangled Qubits

Michael Kues, Christian Reimer, Piotr Roztocki, Benjamin Wetzel, Fabio Grazioso, Yaron Bromberg, Brent E. Little, Sai T. Chu, David Moss, Lucia Caspani, Roberto Morandotti

Published Jan 1, 2016• 0 citations
Publisher

Abstract

We show the generation of multiple time-bin entangled qubits, with high purity and covering the entire L, C, and S telecommunication bands. This is achieved using spontaneous four-wave mixing within an on-chip micro-resonator.
DOI
10.1364/laop.2016.ltu2d.4

Related papers

Generation of Multiple Entangled Qubits from an Integrated Frequency Comb Source

Christian Reimer, Michael Kues, Piotr Roztocki +9 more

Exploiting spontaneous four-wave mixing within an integrated CMOS-compatible microring resonator, we demonstrate the simultaneous generation of multiple time-bin entangled photon pairs, confirmed by quantum interference and state tomography with fidelities above 86%.

OSA Advanced Photonics Congress•Jan 1, 2016•0 citations

Integrated Quantum Frequency Comb Source of Entangled Qubits

Christian Reimer, Michael Kues, Piotr Roztocki +7 more

We demonstrate the simultaneous generation of multiple time-bin entangled photon pairs on a CMOS-compatible photonic chip. We measure quantum interference and perform state tomography, confirming entangled qubits with fidelities above 86% and 99.9% purity.

Conference on Lasers and Electro-Optics•Jan 1, 2016•0 citations

Quantum state generation via integrated frequency combs (Conference Presentation)

Piotr Roztocki, Michael Kues, Christian Reimer +9 more

The on-chip generation of optical quantum states will enable accessible advances for quantum technologies. We demonstrate that integrated quantum frequency combs (based on high-Q microring resonators made from a CMOS-compatible, high refractive-index doped-glass platform) can enable the generation of pure heralded single photons, cross-polarized photon pairs, as well as bi- and multi-photon entangled qubit states over a broad frequency comb covering the S, C, L telecommunications band, with photon frequencies corresponding to standard telecommunication channels spaced by 200 GHz. Exploiting a self-locked, intra-cavity excitation configuration, a highly-stable source of multiplexed heralded single photons is demonstrated, operating continuously for several weeks with less than 5% fluctuations. The photon bandwidth of 110 MHz is compatible with quantum memories, and high photon purity was confirmed through single-photon auto-correlation measurements. In turn, by simultaneously exciting two orthogonal polarization mode resonances, we demonstrate the first realization of type-II spontaneous FWM (in analogy to type-II spontaneous parametric down-conversion), allowing the direct generation of orthogonally-polarized photon pairs on a chip. By using a double-pulse excitation, we demonstrate the generation of time-bin entangled photon pairs. We measure qubit entanglement with visibilities above 90%, enabling the implementation of quantum information processing protocols. Finally, the excitation field and the generated photons are intrinsically bandwidth-matched due to the resonant characteristics of the ring cavity, enabling the multiplication of Bell states and the generation of a four-photon time-bin entangled state. We confirm the generation of this four-photon entangled state through four-photon quantum interference.

•Apr 28, 2017•0 citations

Multi-photon Entangled Quantum State from Integrated Optical Frequency Combs

Christian Reimer, Michael Kues, Piotr Roztocki +7 more

We show the generation of four-photon entangled quantum states exploiting spontaneous four-wave mixing and the multi-mode characteristic of integrated micro-resonators. This is confirmed by four-photon quantum interference and quantum state tomography.

Latin America Optics and Photonics Conference•Jan 1, 2016•0 citations

Noise Contributions in On-Chip Four-Photon States

Yanbing Young Zhang, Mehedi Islam, Piotr Roztocki +10 more

We present the compact and scalable realization of four-photon time-bin entangled states using a quantum frequency comb generated from an integrated photonic chip. We show how noise affects higher-order spontaneous emissions for this state.

Photonics North (PN)•Jun 1, 2018•0 citations

On-chip Generation, Coherent Control and Processing of Complex Entangled Photon States

Stefania Sciara, Raman Kashyap, Alfonso Carmelo Cino +15 more

We demonstrate the on-chip generation of time-bin entangled two- and multi-photon qubit states, as well as high-dimensional frequency-entangled photon pairs. Combining time and frequency entanglement, we generate high-dimensional optical cluster states and implement proof-of-concept high-dimensional one-way quantum computing. This, by using standard, fiber-based telecommunication components.

IEEE/LEOS Summer Topical Meetings•Jul 1, 2019•0 citations
The on-chip generation of optical quantum states will enable accessible advances for quantum technologies. We demonstrate that integrated quantum frequency combs (based on high-Q microring resonators made from a CMOS-compatible, high refractive-index doped-glass platform) can enable the generation of pure heralded single photons, cross-polarized photon pairs, as well as bi- and multi-photon entangled qubit states over a broad frequency comb covering the S, C, L telecommunications band, with photon frequencies corresponding to standard telecommunication channels spaced by 200 GHz. Exploiting a self-locked, intra-cavity excitation configuration, a highly-stable source of multiplexed heralded single photons is demonstrated, operating continuously for several weeks with less than 5% fluctuations. The photon bandwidth of 110 MHz is compatible with quantum memories, and high photon purity was confirmed through single-photon auto-correlation measurements. In turn, by simultaneously exciting two orthogonal polarization mode resonances, we demonstrate the first realization of type-II spontaneous FWM (in analogy to type-II spontaneous parametric down-conversion), allowing the direct generation of orthogonally-polarized photon pairs on a chip. By using a double-pulse excitation, we demonstrate the generation of time-bin entangled photon pairs. We measure qubit entanglement with visibilities above 90%, enabling the implementation of quantum information processing protocols. Finally, the excitation field and the generated photons are intrinsically bandwidth-matched due to the resonant characteristics of the ring cavity, enabling the multiplication of Bell states and the generation of a four-photon time-bin entangled state. We confirm the generation of this four-photon entangled state through four-photon quantum interference.