Bit-serial multiplier based on Josephson latching logic

Moopenn, A.; Arambula, E.R.; Lewis, Mary; Chan, H.

doi:10.1109/77.233983

Cited by 7 publications

(1 citation statement)

References 5 publications

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“…There are many reasons for the switching from the zero to the resistive state in a Josephson junction. Among these, thermal escape 10 , quantum tunneling 11 , latching logic circuits 12 and pulsed assisted escape 13 . A clear cut discrimination between different mechanisms can be difficult to achieve.…”

Section: S1 I S2mentioning

confidence: 99%

Low Tc Josephson Junction Response to an Ultrafast Laser Pulse

Lucignano

Tagliacozzo

Hekking

2004

Quantum Computing and Quantum Bits in Mesoscopic Systems

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By irradiating with a single ultrafast laser pulse a superconducting electrode of a Josephson junction it is possible to drive the quasiparticles (qp's) distribution strongly out of equilibrium. The behavior of the Josephson device can, thus, be modified on a fast time scale, shorter than the qp's relaxation time. This could be very useful, in that it allows fast control of Josephson charge qubits and, in general, of all Josephson devices. If the energy released to the top layer contact S1 of the junction is of the order of ∼ µJ, the coherence is not degradated, because the perturbation is very fast. Within the framework of the quasiclassical Keldysh Green's function theory, we find that the order parameter of S1 decreases. We study the perturbed dynamics of the junction, when the current bias is close to the critical current, by integrating numerically its classical equation of motion. The optical ultrafast pulse can produce switchings of the junction from the Josephson state to the voltage state. The switches can be controlled by tuning the laser light intensity and the pulse duration of the Josephson junction.

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