Conference on Lasers and Electro-Optics

On-chip Generation of Four-Photon Entangled Qubit States

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

Published Jan 1, 2016• 0 citations

Publisher

Abstract

We demonstrate four-photon entangled qubits generated from an integrated quantum frequency comb source. This is confirmed by four-photon quantum interference with a visibility above 89%, and quantum state tomography revealing a fidelity above 64%.

DOI: 10.1364/cleo_qels.2016.fm2n.1

Related papers

Generation of multi-photon entangled states with integrated optical frequency comb sources

Christian Reimer, Michael Kues, Piotr Roztocki +7 more

We demonstrate that four-photon entangled qubit states can be generated from an optical frequency combs source. This state generation is evidenced by four-photon quantum interference, and quantum state tomography reveals a fidelity above 64%.

Frontiers in OpticsJan 1, 20163 citations

Four-Photon Entanglement Generation with Integrated Optical Frequency Combs

Christian Reimer, Michael Kues, Piotr Roztocki +7 more

We demonstrate the generation of four-photon entangled quantum states with integrated optical frequency comb sources. We measure four-photon quantum interference with a visibility above 89%, and perform quantum state tomography revealing a fidelity above 64%.

OSA Advanced Photonics CongressJan 1, 20160 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-OpticsJan 1, 20160 citations

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 CongressJan 1, 20160 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 ConferenceJan 1, 20160 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, 20170 citations