Finite one-dimensional arrays of Josephson junctions : vestiges of a quantum phase transition

David B. Haviland, Edmund Chow, Per Delsing

Jorge V. José, T. K. Kopeć

J. G. Kissner, Ulrich Eckern

Jacek Dziarmaga, Augusto Smerzi, Wojciech Hubert Zurek +1 more

We study the dynamics of the Mott insulator-superfluid quantum phase transition in a periodic 1D array of Josephson junctions. We show that crossing the critical point at a finite rate with a quench time tau(Q) induces finite quantum fluctuations of the current around the loop proportional to tau(-1/6)(Q). This scaling could be experimentally verified with an array of weakly coupled Bose-Einstein condensates or superconducting grains.

Siyuan Han, A. Hodge Worsham, James E. Lukens

The RF power at approximately 300 GHz coupled to a 52- Omega load by a one-dimensional DC series biased Josephson junction array has been measured using an on-chip Josephson detector. The array was fabricated using the planarized all-refractory technology for low-T/sub c/ superconductivity (PARTS). From the measured RF power and DC voltage levels, it is concluded that the 100 junctions in this array were locked in-phase. The effects of the finite inductance, associated with the junction's shunt resistor, on the array output power and detector's current-voltage characteristics are also discussed.>

Caspar H. van der Wal, P Kuiper, Johan E. Mooij