1.48 milliseconds! The Longest "Longevity" Quantum Bit to Date Appears

Science and Technology Daily, Beijing, May 30 (Reporter Liu Xia) A superconducting quantum bit - magnetic flux quantum bit has maintained its quantum properties for about 1.48 milliseconds, which is much longer than the "life" of similar quantum bits currently favored by the quantum computing industry, and is expected to make future quantum computer more practical

Science and Technology Daily, Beijing, May 30 (Reporter Liu Xia) A superconducting quantum bit - magnetic flux quantum bit has maintained its quantum properties for about 1.48 milliseconds, which is much longer than the "life" of similar quantum bits currently favored by the quantum computing industry, and is expected to make future quantum computer more practical. The relevant papers were published in the latest issue of the journal 'Physical Review Letters'.

The first step in building a quantum computer is to choose how to manufacture its key component, quantum bits. The most successful superconducting quantum bit in commerce to date is the transporter. But like all quantum bits, if there is any small interference in the environment, these quantum bits will lose their quantum properties in a short period of time and cannot store and process information. Now, the team of Aaron Smirno from the University of Maryland has proved that the magnetic flux quantum bit can keep quantum properties for a longer time.

In the latest research, Smirno's team laid extremely thin titanium and aluminum wires in a special configuration on the sapphire chip, forming many channels between rows of superconducting "islands", thus producing magnetic flux quantum bits. These thin wires are superconductors only at extremely cold temperatures, so they are stored in refrigerators with temperatures close to absolute zero.

When the chip is powered on, the special layout and superconducting properties of the wires give it several different quantum states, each of which can be used to encode information as 1 and 0 or a combination of the two. The research team also measured the Coherence time of the chip to reveal the "lifetime" of the qubit.

Smirno pointed out that the Coherence time of the best transport quantum bit is only hundreds of microseconds, while the Coherence time of the magnetic flux quantum is about 1.48 milliseconds. They can also change the state of the quantum bit, with a fidelity of 99.991%, making it one of the most reliable quantum bits available.

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