Traveling-Wave Parametric Amplifier for Scalable Quantum Computing

This paper reports a parametric amplifier that achieves both broadband forward amplification and backward isolation in a single, compact, non-magnetic circuit. The amplifier is designed for use in superconducting quantum computers, where high-fidelity qubit measurement is critical. Superconducting parametric amplifiers are widely used as the first amplifier in the chain due to their low noise performance.

The reported amplifier relies on a nonlinear transmission line that supports traveling-wave parametric amplification of forward propagating signals and isolation via frequency conversion of backward propagating signals. This approach eliminates the need for isolators and circulators, which are typically used to route signals and protect qubits from amplified noise. The traveling-wave parametric amplifier and converter has the potential to reduce the readout hardware overhead when scaling up the size of superconducting quantum computers.

The compact, non-magnetic design of the amplifier makes it suitable for on-chip integration with superconducting qubits. This could further reduce size and complexity, leading to more efficient and scalable quantum computing systems. However, the performance and reliability of the amplifier in real-world quantum computing environments need to be validated. Manufacturing and integration challenges could also arise. Further research is needed to address these challenges and realize the full potential of this technology.

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