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This is a hardware-level result in superconducting quantum computing: reading a transmon qubit at over 99% fidelity using millimeter waves, without a quantum limited amplifier. If it holds up at scale, it could simplify readout chains, which are a real cost and complexity bottleneck. The work is still a laboratory demonstration, so readers should watch for replication and for how the approach performs in multi-qubit systems.

Source coveringQuantum Zeitgeist

Millimeter waves read out a qubit with 99% accuracy

Quantum ZeitgeistOctober 30, 20267 min read

Millimeter waves are emerging as an enabling technology for connecting and enhancing different quantum platforms, including superconducting qubits. Researchers achieved a measurement fidelity greater than 99% when reading out a qubit state using millimeter waves and up to 1,000 drive photons, without a quantum limited amplifier.

Akash V. Dixit and colleagues from the National Institute of Standards and Technology and the University of Colorado Boulder have demonstrated a qubit readout with over 99% accuracy without relying on a quantum limited amplifier. The team achieved this performance by using millimeter waves to interact with a transmon qubit within a circuit quantum electrodynamic system, coupled at a rate of 230 MHz. A key to their success was suppressing unwanted state transitions by maintaining a large frequency separation, where ωr/ωq > 10, and using up to 1,000 drive photons. This approach offers a path toward simpler and potentially less expensive quantum computing infrastructure. This level of accuracy demonstrates a potential simplification of quantum computing infrastructure, reducing the need for complex and costly amplification systems. Researchers envision this technology as a key component in future hybrid quantum systems,…

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