Josephson parametric amplifiers (JPAs) are important tools in quantum information technology, and traveling-wave JPAs with extended bandwidth are especially desired for frequency multiplexing, $e.g.$ in qubit readout. So far these devices have required the four-wave mixing condition to operate. The author shows, however, that there is a way to realize t00exh00exr00exe00exe-w00exa00exv00exe mixing, with negligible phase mismatch. This simple traveling-wave amplifier would offer large gain, wide bandwidth, and ultimately quantum-limited characteristics, outperforming its state-of-the-art four-wave counterparts.
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A. B. Zorin (2016) studied this question.
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