A new study said that there have been two new advances in the conversion technology between quantum information and microwave and light wave propagation. Most of the cutting-edge quantum technologies, including superconducting qubits and quantum dots (Quantum Dot), transmit information through photons in the form of microwaves. Although this method excels in quantum controllability, the distance of information transmission is very short, limited to a few centimeters.
At the same time, the field of quantum communication has made good progress in transmitting information in the optical telecom band. The distance of optical fiber-based quantum networks can reach thousands of kilometers.
“In order to connect quantum computers far apart into a quantum Internet, it is important to realize the conversion of quantum information between microwaves and light waves.” One of the researchers is Grobche, TU Delft, The Netherlands. (Simon Groeblacher) said, “This is not only in the quantum field
This study improved this conversion technique in two ways.
One is to perform signal conversion in the quantum ground state, and the researchers found that this greatly reduces the interference of thermal noise.
Another lead author, Moritz Forsch, said that other studies have explored ways to achieve this, such as connecting signals to mechanical oscillators is a good approach. However, this method brings a significant background thermal error.
Furthermore, researchers have used a new piezoelectric material, gallium phosphide (GaP), to make this mechanical oscillator. Piezoelectric materials generate electric fields by mechanical pressure, which may have good prospects for the conversion of quantum information in different ways. The study was published this month in Nature Physics and Physical Review Letters.