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A Filter for Cleaner Qubits


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Bloch sphere representation of a qubit.

Researchers in Japan have developed a way to increase the lifetime of qubits inside quantum computers, through the use of an additional "filter" qubit.

Credit: Smite-Meister

Researchers at Tokyo Medical and Dental University (TMDU), RIKEN, and the University of Tokyo in Japan have developed a method to increase the lifetime of qubits inside quantum computers through the use of an additional "filter" qubit.

The team demonstrated  how coupling a second filter qubit to the control line can significantly reduce the noise and spontaneous radiative losses that result in decoherence.

Said TMDU's Kazuki Koshino, "In our solution, the filter qubit acts like a nonlinear mirror, which completely reflects radiation from the qubit due to destructive interference but transmits strong control pulses due to absorption saturation."

From Tokyo Medical and Dental University
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Abstracts Copyright © 2020 SmithBucklin, Washington, DC, USA


 

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