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Superconductor-insulator transition in nanowires and nanowire arrays
Hans Mooij, Gerd Schön, Alexander Shnirman +4
Superconducting nanowires are the dual elements to Josephson junctions, with quantum phase-slip processes replacing the tunneling of Cooper pairs. When the quantum phase-slip ampli…
Selective darkening of degenerate transitions demonstrated with two superconducting quantum bits
P. C. de Groot, J. Lisenfeld, R. N. Schouten +4
Controlled manipulation of quantum states is central to studying natural and artificial quantum systems. If a quantum system consists of interacting sub-units, the nature of the co…
Low-crosstalk bifurcation detectors for coupled flux qubits
P. C. de Groot, A. F. van Loo, J. Lisenfeld +4
We present experimental results on the crosstalk between two AC-operated dispersive bifurcation detectors, implemented in a circuit for high-fidelity readout of two strongly couple…
QND measurement of a superconducting qubit in the weakly projective regime
T. Picot, R. Schouten, C. J. P. M. Harmans +1
Quantum state detectors based on switching of hysteretic Josephson junctions biased close to their critical current are simple to use but have strong back-action. We show that the…
Observation of the Bloch-Siegert Shift in a Qubit-Oscillator System in the Ultrastrong Coupling Regime
P. Forn-Díaz, J. Lisenfeld, D. Marcos +4
We measure the dispersive energy-level shift of an resonator magnetically coupled to a superconducting qubit, which clearly shows that our system operates in the ultrastrong c…
Josephson squelch filter for quantum nanocircuits
P. Forn-Diaz, R. N. Schouten, W. A. den Braver +2
We fabricated and tested a squelch circuit consisting of a copper powder filter with an embedded Josephson junction connected to ground. For small signals (squelch-ON), the small j…