A multi-stage traveling-wave parametric amplifier achieves 20 dB forward gain over 1.6 GHz, >35 dB reverse isolation, and 1.7 times quantum-limited noise using a passive reflectionless filter between two four-wave-mixing stages.
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Traveling-Wave Parametric Amplifier with Passive Reverse Isolation
A multi-stage traveling-wave parametric amplifier achieves 20 dB forward gain over 1.6 GHz, >35 dB reverse isolation, and 1.7 times quantum-limited noise using a passive reflectionless filter between two four-wave-mixing stages.