New approach for addressing quantum dots gives prospects to scale the number of qubits in quantum systems and represents a breakthrough for quantum computing. Researchers have developed a way to address many quantum dots with only a few control lines using a chessboard-like method. This enabled the
Photograph of the quantum chip hosting the 16 quantum dot crossbar array, seamlessly integrated to a chessboard motif. Every quantum dot, like a pawn on a chessboard, is uniquely identifiable and controllable using a coordinate system of letters and numbers. Photo credit: Marieke de Lorijn for QuTech. Credit: Marieke de Lorijn for QuTech
New approach for addressing quantum dots gives prospects to scale the number of qubits in quantum systems and represents a breakthrough forResearchers have developed a way to address many quantum dots with only a few control lines using a chessboard-like method. This enabled the operation of the largest gate-defined quantum dot system ever. Their result is an important step in the development of scalable quantum systems for practical quantum technology.
Quantum dots can be used to hold qubits, the foundational building blocks of a quantum computer. Currently, each qubit requires its own addressing line and dedicated control electronics. This is highly impractical and in stark contrast with today’s computer technology, where billions of transistors are operated with only a few thousand lines.Researchers at QuTech—a collaboration between the Delft University of Technology and TNO—have developed a similar method for addressing quantum dots.
First author Francesco Borsoi explains: “This new way of addressing quantum dots is advantageous for scaling up to many qubits. If a single qubit is controlled and read out using a single wire, millions of qubits will require millions of control lines. This approach does not scale very well. However, if qubits can be controlled using our chessboard-like system, millions of qubits could be addressed using ‘only’ thousands of lines, corresponding to a ratio very similar to those in computer chips.
Reference: “Shared control of a 16 semiconductor quantum dot crossbar array” by Francesco Borsoi, Nico W. Hendrickx, Valentin John, Marcel Meyer, Sayr Motz, Floor van Riggelen, Amir Sammak, Sander L. de Snoo, Giordano Scappucci and Menno Veldhorst, 28 August 2023,
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