Josephson Parametric Converter: More results have been obtained with the JPC. After amplification with high gain (> 30dB) and frequency up- and down-conversion, we have demonstrated two-mode squeezing of quantum noise of more than 18dB. Using a nanowire in the hot electron regime as noise source, we have found excellent system noise temperatures of 130 mK, i.e., 40 times better than a typical HEMT amplifier.
Inline Transmon: We've made our first prototype sample and cooled it to low temperatures. With our initial choice of circuit elements for the prototype, the inline-Transmon shows respectable relaxation and coherence times in the hundreds of nanoseconds. We are currently fabricating a new sample with better couplings.
Subalpha Qubit: A 44 junction array loop in series with a small Josephson junction coupled to a balanced 8GHz cavity is currently being measured via 2-tone microwave spectroscopy. Coherence time of the qubit transition exceeds 2 µs.
