Multiplexing of Cooper pairs to protect qubits in quantum computers from noise

مضاعفة أزواج Cooper لحماية الكيوبتات في أجهزة الكمبيوتر الكمومية من الضوضاء

Experimental implementation. (a) Schematic diagram of the inductively transformed kite extended electrical circuit including the cut-off LC oscillator (maroon) added to the dispersive read, which is inductively mated to the circuit through a common inductance (purple). (b) Optical micrograph of the physical device, with aluminum electrodes in light gray and niobium electrodes in dark gray. Direct currents, microwave drives, and readout signals are routed in and out of the system through two on-chip flux bias lines (right and bottom) and a poorly conducting pin (top left). Internal parts: scanning electron microscope images of a single group of large junctions [all inductances pictured in (a) are implemented similarly] And one small intersection. attributed to him: X . physical review (2022). DOI: 10.1103/ PhysRevX.12.021002

A team of researchers affiliated with several institutions in France has developed a way to use pairs of Cooper pairs to protect the qubits inside a quantum computer from outside noise. In their paper published in the journal X . physical reviewthe group describes how they addressed the problem of qubit sensitivity to noise and how well their approach worked when tested.

Obstacle to the development of quantum computers external noise affect qubits. One of the most promising methods for dealing with noise is delocalization quantum information used in the computer. This is because the noise that creates the problems is usually local. The idea is not to specify where the information is stored, and researchers have developed a new way to do this.

Inside a quantum computer superconducting circuits—Their states can be described using pairs of electrons known as Cooper pairs. In such systems, pairs spend across the Josephson junction. Researchers have come up with a new type of superconductivity qubit where quantum states are not determined by Josephson junction modulation. In their setup, two Cooper pairs were allowed to drill through the tunnel simultaneously. The junction is created using a superconducting ring that also uses superconductors. Using this approach allowed the team to control for the co-tunneling component of motor interference. This suppressed the tunnel of unwanted Cooper pairs, allowing those who were digging in the tunnel to pass unharmed. This approach doubled the amplification of the superconducting phase.

The system showed a 10-fold decrease in the sensitivity of the bits to noise. The researchers plan to test adding quantum phase slip to their system. This would allow to Noise reduction In both phase and charge spaces, providing a higher degree of protection.


Scientists take a step towards quantum supremacy


more information:
WC Smith et al, Quantitative magnification of phase fluctuations using Cooper–Pair coupling, X . physical review (2022). DOI: 10.1103/ PhysRevX.12.021002

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