Proposed Experimental Demonstration of Negativity

Andreas Wicht, M. Müller, R.-H. Rinkleff +2 more

M. A. B. Bég

Vasili K. Semenov, G.V. Danilov, D. V. Averin

It has been known for a long time that the thermodynamic limit k/sub B/Tln2 on the energy dissipation per logic operation can be overcome by physically and logically reversible circuits. However, explicit experimental demonstration of this is still lacking, and would be highly desirable both in its own right and in view of strong interest in inherently reversible quantum computation. In this work, we suggest a new gate, "negative-inductance SQUID", that is suitable for the experimental demonstration of reversible information processing in Josephson-junction circuits, and present results of its theoretical analysis. We also describe layout-level designs of an individual nSQUID and an 8-cell circular shift register made of nSQUIDs.

Roger Gomm

Fabio Benatti, Roberto Floreanini B

Jennifer M. Knall, Magnus Engholm, Tommy Boilard +2 more

We will report the first demonstration of an optically cooled fiber amplifier. The fiber was made of silica, had a core doped with Yb, and was core-pumped to achieve both gain and cooling in the core via anti-Stokes fluorescence. Gains larger than 10 dB were measured while maintaining a negative average temperature change along the fiber.