Nanowerk December 1, 2021
The capacitor electrodes that comprise the qubits in quantum computers must be large to avoid lossy dielectrics. This hinders scaling degrading individual qubit addressability and limiting the spatial density of qubits. An international team of researchers (USA – Columbia University, Raytheon BBN Technologies, Japan) took advantage of the unique properties of van der Waals (vdW) materials to reduce the qubit area by >1000 times while preserving the capacitance while maintaining quantum coherence. The qubits combine conventional aluminum-based Josephson junctions with parallel-plate capacitors composed of crystalline layers of superconducting niobium diselenide and insulating hexagonal boron nitride. The coherence time was short a little over 1 microsecond, compared to about 10 microseconds for a conventionally built coplanar capacitor. According to the researchers 2D materials may hold the key to making quantum computers possible…read more. TECHNICAL ARTICLEÂ
Abstract. Credit: Nano Lett. 2021, XXXX, XXX, XXX-XXX, November 18, 2021Â