We study the dynamics of multi-junction switching (MJS): several intrinsic Josephson junctions (IJJs) in an array switch to the finite voltage state simultaneously. The number of multi-switching junctions ( N ) was successfully tuned by changing the load resistance serially connected to an Bi 2 Sr 1.6 La 0.4 CuO 6+δ IJJ array. The independence of the escape rates of N in the macroscopic quantum tunneling regime indicates that MJS is a successive switching process rather than a collective process. The origin of MJS is explained by the gradient of a load curve and the relative magnitudes of the switching currents of quasiparticle branches in the current–voltage plane.We study the dynamics of multi-junction switching (MJS): several intrinsic Josephson junctions (IJJs) in an array switch to the finite voltage state simultaneously. The number of multi-switching junctions ( N ) was successfully tuned by changing the load resistance serially connected to an Bi 2 Sr 1.6 La 0.4 CuO 6+δ IJJ array. The independence of the escape rates of N in the macroscopic quantum tunneling regime indicates that MJS is a successive switching process rather than a collective process. The origin of MJS is explained by the gradient of a load curve and the relative magnitudes of the switching currents of quasiparticle branches in the current–voltage plane.

arXiv:1004.1893Applied Physics ExpressApr 2, 20106 citations

Fabrication of submicron La2 xSrxCuO4 intrinsic Josephson junction stacks

Yuimaru Kubo, Takahide, Y., Tanaka, T. +6 more

Intrinsic Josephson junction (IJJ) stacks of cuprate superconductors have potential to be implemented as intrinsic phase qubits working at relatively high temperatures. We report success in fabricating submicron La $_{2-x}$ Sr $_{x}$ CuO $_{4}$ (LSCO) IJJ stacks carved out of single crystals. We also show a new fabrication method in which argon ion etching is performed after focused ion beam etching. As a result, we obtained an LSCO IJJ stack in which resistive multi-branches appeared. It may be possible to control the number of stacked IJJs with an accuracy of a single IJJ by developing this method.Intrinsic Josephson junction (IJJ) stacks of cuprate superconductors have potential to be implemented as intrinsic phase qubits working at relatively high temperatures. We report success in fabricating submicron La$_{2-x}$Sr$_{x}$CuO$_{4}$ (LSCO) IJJ stacks carved out of single crystals. We also show a new fabrication method in which argon ion etching is performed after focused ion beam etching. As a result, we obtained an LSCO IJJ stack in which resistive multi-branches appeared. It may be possible to control the number of stacked IJJs with an accuracy of a single IJJ by developing this method.

Jan 1, 20115 citations

Switching of Moderately-Damped Josephson Junctions

Paul A. Warburton

Jan 1, 20080 citations

Macroscopic quantum tunneling in Bi2212 intrinsic Josephson junctions

K. Inomata, Sato Shigeo, Yuuki Nakamiya +4 more

IEICE Technical Report; IEICE Tech. Rep.Jan 20, 20060 citations

_{2-x}

_{x}

CuO

_{4}

(LSCO) IJJ stacks carved out of single crystals. We also show a new fabrication method in which argon ion etching is performed after focused ion beam etching. As a result, we obtained an LSCO IJJ stack in which resistive multi-branches appeared. It may be possible to control the number of stacked IJJs with an accuracy of a single IJJ by developing this method.