Fully Directional Quantum-limited Phase-Preserving Amplifier

• URL: http://arxiv.org/abs/2305.04184v2
• Date: Sat, 13 May 2023 12:39:07 GMT
• Title: Fully Directional Quantum-limited Phase-Preserving Amplifier
• Abstract summary: We present a way to achieve fully directional, quantum-limited amplification in a four-port, four-mode superconducting Josephson circuit. Full directionality, defined as the reverse isolation surpassing forward gain between the matched input and output ports of the amplifier, ensures its robustness against impedance mismatch. Unlike existing directional phase-preserving amplifiers, both the minimal back-action and the quantum-limited added noise of this amplifier remains unaffected by noise incident on its output port.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a way to achieve fully directional, quantum-limited phase-preserving amplification in a four-port, four-mode superconducting Josephson circuit by utilizing interference between six parametric processes that couple all four modes. Full directionality, defined as the reverse isolation surpassing forward gain between the matched input and output ports of the amplifier, ensures its robustness against impedance mismatch that might be present at its output port during applications. Unlike existing directional phase-preserving amplifiers, both the minimal back-action and the quantum-limited added noise of this amplifier remains unaffected by noise incident on its output port. In addition, the matched input and output ports allow direct on-chip integration of these amplifiers with other circuit QED components, facilitating scaling up of superconducting quantum processors.

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