Researchers from the Niels Bohr Institute at the University of Copenhagen have significantly improved coherence times.
As a first step, the research teamcombined the membrane with a superconducting microwave circuit that allows accurate readings to be taken from it. That is, it has become “connected”, as is required for almost any application. Thanks to this development, the membrane can be connected to various other devices that process or transmit quantum information.
The device used in this work.
The square structure closer to the center is the superconducting circuit, and the red dot in the center corresponds to the connection with the movement of the membrane.
The honeycomb structure is used to isolate the movement of the membrane, which occurs mainly at the red dot position, from the frame to which it is attached.
Credit: Niels Bohr Institute
Since the ambient temperature determinesthe level of random forces disturbing the membrane, it is necessary to reach a sufficiently low temperature. The goal is to prevent the quantum state of motion from being “washed out.” Physicists achieve this with the help of a helium-based cooling unit. Using a microwave circuit, they can then control the quantum state of motion of the membrane. In their recent work, the researchers were able to prepare the membrane in the quantum ground state. This means that its motion is dominated by quantum fluctuations. The quantum ground state corresponds to an effective temperature of 0.00005 degrees above absolute zero, which is –273.15 °C.
Applications for Connected Quantum Membraneor quantum drum a lot. It is possible to use a slightly modified version of this system, which can sense the forces of both microwave and optical signals, to create a quantum converter from microwave to optical. Quantum information can be transmitted at room temperature in optical fibers over kilometers without disturbance. On the other hand, the information is typically processed inside a cooling device capable of reaching temperatures low enough to operate superconducting circuits such as a membrane. Thus, connecting these two systems—superconducting circuits with optical fibers—could enable the creation of a quantum internet: multiple quantum computers , connected together by optical fibers.
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