Project Progress & Achievements: May 2020
QMiCS’ significant progress is best illustrated with three selected highlights. First, as a key step towards a quantum advantage in microwave illumination, we have built a number‑resolving photocounter for propagating microwaves. The device catches the microwave mode using parametric frequency conversion and counts its number of photons with superconducting qubit. The current device can count of up to 3 photons, but could straightforwardly be improved to larger numbers.
A second highlight result of QMiCS is the development of a commercial 6.6 m long link between two dilution refrigerators representing two nodes of a future quantum microwave communication network. A cryogenic networking node (CNN) at the midpoint of this link ensures further connectivity and straightforward scalability to larger distances. In a successful factory acceptance of the half link consisting of one fridge and the CNN, temperatures along the link have not exceeded 35 mK.
In the second half of the project, we will use this installation for quantum microwave teleportation between two laboratories. Third, we have implemented remote state preparation (RSP) of squeezed microwave light over the macroscopic distance of 35 cm (Figure 3). RSP is a particular variant of quantum teleportation, where the teleported state of light is known to the sender.
In addition to realizing the first continuous‑ variable microwave communication protocol, we demonstrate an inherent relation of RSP to secure communication by introducing the concept of quantum one‑time pad cryptography.
Find more information about what QMiCS has achieved here.
To mark the mid-point of the Quantum Technologies Flagship’s eighteen-month ramp-up phase in May 2020, a mid-term review was published with information about the achievements of all the projects. Read it here.