**(AsianScientist)** Researchers in Japan have devised a way to connect qubits that could make quantum computers more feasible. A team of scientists from Tokyo University of Science, RIKEN Centre for Emergent Matter Science and University of Technology, Sydney, have developed a unique solution to qubit accessibility problem by modifying the architecture of the qubit array. By arranging qubits in a pseudo two-dimensional array, these scientists have simplified the construction of quantum computers.

The basic units of a quantum computer are the quantum bits or qubits. These are typically atoms, ions, photons, subatomic particles such as electrons, or even larger elements that simultaneously exist in multiple states, making it possible to obtain several potential outcomes rapidly for large volumes of data. The theoretical requirement for quantum computers is that these are arranged in two-dimensional (2D) arrays, where each qubit is both coupled with its nearest neighbor and connected to the necessary external control lines and devices. When the number of qubits in an array is increased, it becomes difficult to reach qubits in the interior of the array from the edge. The need to solve this problem has so far resulted in complex three-dimensional (3D) wiring systems across multiple planes in which many wires intersect, making their construction a significant engineering challenge.

“Here, we solve this problem and present a modified superconducting micro-architecture that does not require any 3D external line technology and reverts to a completely planar design,” the researchers said.