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HomeSciencePhysicsNew Qubit Enters the Quantum-Computer Arena

New Qubit Enters the Quantum-Computer Arena

• Physics 15, s130

A brand new sort of superconducting qubit might resolve a “crowding” drawback that hinders the event of superconducting quantum computer systems with massive numbers of qubits.

Chávez-Garcia et al. [1]

When it involves superconducting quantum processors, the go-to qubit is the “transmon,” which has a low sensitivity to noise. Processors with greater than 50 transmons are available, and a system with 127 transmons was lately demonstrated. Despite these achievements, transmons have operational points that might hinder methods containing bigger numbers of those qubits. Now Baleegh Abdo and colleagues at IBM Research Center in New York have developed a brand new superconducting qubit that solves one in every of these issues [1]. The new qubit might doubtlessly substitute transmons within the subsequent set of superconducting quantum processors.

The situation that the staff addresses is the “frequency-collision” drawback. In the previous, transmon qubits operated at a set frequency, that means that in circuits containing massive numbers of them, gate errors might happen due to overlap within the qubits’ excitation energies. Having neighboring qubits with barely totally different operational frequencies can resolve the difficulty. But earlier tunable transmons have been extremely inclined to noise, similar to magnetic-flux noise, which might trigger speedy dephasing of the transmons and gate errors.

Abdo and colleagues get across the situation by making a frequency-tunable qubit that doesn’t undergo from dephasing. Like transmons, their “weakly tunable qubit” (WTQ) operates utilizing Josephson junctions, but it surely incorporates three junctions moderately than one. Each junction has barely totally different properties, which the staff exploits to tune every qubit’s frequency by just a few tenths of a %. The tunability is massive sufficient to keep away from frequency collisions but sufficiently small to restrict their susceptibility to noise. The researchers says that their use of Josephson junctions ought to assist within the adoption of WTQs, as they’re made utilizing the identical processes as transmons.

–Katherine Wright

Katherine Wright is the Deputy Editor of Physics Magazine.


  1. J. M. Chávez-Garcia et al., “Weakly flux-tunable superconducting qubit,” Phys. Rev. Appl. 18, 034057 (2022).

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