Multimode cOrrelations in microwave photonics with Superconducting quAntum Circuits

Project Information

MOSAiC

Grant agreement ID: 835791

DOI

10.3030/835791

Project closed

EC signature date 9 April 2019

Start date 1 October 2019

End date 30 September 2021

Funded under

• EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions

Total cost

€ 184 707,84

EU contribution

€ 184 707,84

Coordinated by

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
France

Periodic Reporting for period 1 - MOSAiC (Multimode cOrrelations in microwave photonics with Superconducting quAntum Circuits)

Reporting period: 2019-10-01 to 2021-09-30

Summary of the context and overall objectives of the project

Photonic multimode continuous variable (CV) quantum states have been experimentally demonstrated at optical frequencies, but they are still not established in the microwave regime.
“Mosaic” addresses this challenge, aiming at demonstrating multimode entangled quantum states with Josephson meta-materials.

Quantum states of light consisting of many entangled modes (multimode entangled states) provide a powerful quantum resource and have been recently proposed as a platform for universal quantum computing.
The aim of this project is to generate broadband multimode entangled states for the first time in the microwave regime.
Superconducting quantum circuits, specifically, Josephson meta-materials, are used to generate and control quantum correlations between different frequency modes in microwave photons.

The experimental proof that Josephson-metamaterial can be successfully used as sources of itinerant quantum states of microwave radiation represents a decisive step forward for the exploration of novel microwave photonics experiments for quantum technology applications.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

The first key achievement of Mosaic is the development of a novel superconducting device, a traveling wave parametric amplifier (TWPA) whose unit cell is a SNAIL (superconducting nonlinear asymmetric inductive element) circuit. It has been proved that such a device can be used to achieve near-quantum-limited parametric amplification with a novel phase matching mechanism (Reversed Kerr Phase matching) and with bandwidth performance that improved the state of the art.

The second key achievement is the first demonstration of two-mode squeezing generation in a travelling wave parametric amplifier. The novel Reversed Kerr TWPA, developed in the first part of the project, has been successfully used as a source of multimode entanglement. This experimental result is the main milestone of the whole project.

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

Within this project, two-mode-squeezing and broadband entanglement generation in a TWPA device has been experimentally demonstrated for the first time.
Such a key achievement opens an interesting avenue to the use of TWPA devices as a playground for microwave photonics experiments.

Sketch of multimode entanglement generation with a Josephson meta-material