Non-degenerate near quantum-limited amplification up to 1T

Josephson Junction based quantum-limited amplifiers have become essential components for the detection and readout of microwave quantum circuits. Despite the significant advances made over the last decade on their saturation power and instantaneous bandwidth, they still have limited applicability in systems that require high magnetic fields. The use of high kinetic inductance materials like granular Aluminum (grAl), opens the path for low noise amplification in Tesla fields thanks to their in-plane resilience [1] and negligible high order non-linearities [2], which is particularly attractive for axions search [3], readout of semiconducting spin-qubits [4] or operation of single molecular magnet qubits [5]. Here we present a non-degenerate parametric amplifier made of two coupled grAl resonators forming a Bose-Hubbard dimer [6, 7]. We report near quantum-limited 20 dB amplification, with an instantaneous bandwidth of few MHz and signal-to-pump detuning above 100 MHz, which was stable up to 1 T.
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