Nicolas Zapata 

Near quantum-limited amplification up to 1 T using grAl resonators

Josephson Junction based amplifiers have become essential components for the readout of microwave quantum circuits. Despite the advances made over the last decade, 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 the readout of semiconducting spin-qubits [3] and single molecular magnet qubits [4]. Here we present a non-degenerate parametric amplifier made of two coupled grAl resonators forming a Bose-Hubbard dimer [5, 6]. We report near quantum[1]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.