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The Effect of Parameter Variations on the Performance of the Josephson Travelling Wave Parametric Amplifiers
Searbhán Ó Peatáin, Tom Dixon, Phil J. Meeson +3
We have simulated the performance of the Josephson Travelling Wave Parametric Amplifier (JTWPA) based on the one-dimensional array of RF SQUIDs. Unlike the ideal model in which all…
Coherent quantum phase slip
O. V. Astafiev, L. B. Ioffe, S. Kafanov +5
A hundred years after discovery of superconductivity, one fundamental prediction of the theory, the coherent quantum phase slip (CQPS), has not been observed. CQPS is a phenomenon…
Charge transport through ultrasmall single and double Josephson junctions coupled to resonant modes of the electromagnetic environment
Yu. A. Pashkin, H. Im, J. Leppäkangas +5
We have investigated charge transport in ultrasmall superconducting single and double Josephson junctions coupled to resonant modes of the electromagnetic environment. We observe p…
Ultimate on-chip quantum amplifier
O. Astafiev, A. A. Abdumalikov, A. M. Zagoskin +3
We report amplification of electromagnetic waves by a single artificial atom in open 1D space. Our three-level artificial atom -- a superconducting quantum circuit -- coupled to a…
Resonance Fluorescence of a Single Artificial Atom
O. Astafiev, A. M. Zagoskin, A. A. Abdumalikov +5
An atom in open space can be detected by means of resonant absorption and reemission of electromagnetic waves, known as resonance fluorescence, which is a fundamental phenomenon of…
Parity effect in Al and Nb single electron transistors in a tunable environment
A. M. Savin, M. Meschke, J. P. Pekola +4
Two different types of Cooper pair transistors, with Al and Nb islands, have been investigated in a tunable electromagnetic environment. The device with an Al island demonstrates g…
Temperature square dependence of the low frequency 1/f charge noise in the Josephson junction qubits
O. Astafiev, Yu. A. Pashkin, Y. Nakamura +2
To verify the hypothesis about the common origin of the low frequency 1/f noise and the quantum f noise recently measured in the Josephson charge qubits, we study temperature depen…