QUANTUM DYNAMICS OF A COOPER PAIR TRANSITORCOUPLED TO A DC-SQUID

Aurélien Fay

under the supervision of :

Olivier BUISSON - Wiebke GUICHARD - Laurent LEVY

Centre de Recherche sur les Très Basses Températures

Laboratoire des Champs Magnétiques Intenses (GHMFL)

GRENOBLE

CIRCUIT FABRICATION BY ELECTRONIC LITHOGRAHY

DC-SQUIDCOOPER PAIR TRANSISTOR

CHARGE QUBIT : COOPER PAIR TRANSISTOR

Charge Energy Josephson Energy

Two levels system at pg = 0.5

Vg

300 nm

JJs15 μm²

superconducting loop

15 m

Ip

dc

PHASE QUBIT : DC-SQUID

|0|1

|2

MW

p(Ip, dc )

U (Ip, dc )

J. Claudon and al., Coherent oscillations in a superconducting multi-level quantum system, Phys. Rev. Lett. 93, 187003 (2004).

Multi level system

1/190 MHz-1

0.5

COUPLING BETWEEN A COOPER PAIR TRANSISTOR AND DC-SQUID (TRSQ)

190 MHz

pulse

0.553

Pg

t

Vg

On resonance