Quantum Information with Solid-State Devices VO 141.246 Dr. - - PowerPoint PPT Presentation

Quantum Information with Solid-State Devices

VO 141.246

• Dr. Johannes Majer

Lecture 7

Exam

• I assign a paper related to the class
• fix a date
• you present the paper/we discuss, questions

with special focus on what we learned during the lecture

tunnel junction

Shadow Evaporation

• 1. ele c tron b e a m w riting
• 2. d e v elop m e nt
• 3. first alu minu m e v a pora tion

e- e- e- e- e- e- PMM A/M A A Substra t e Al Al O 2 O 2

• 4. o xid a tion

Al Al

• 5. s e c ond alu minu m e v a pora tion
• 6. lift-off

PMM A PMM A PMM A

RF SET

LC tank circuit, impedance transformer

!! !"#$ " "#$ ! !#$ % !! !"#& !"#' !"#( !"#% " "#% "#( "#' "#& ! )*!"

!+

,!-%*.*"/ ,0!%!!!1-%*.*%23-4/ ,0!!!!%1-%*.*!%23-4/ 5674*896:;4*<;=0>;*8;1-4 ?@A:34*B:6C<*>@D76;4*0>1

!! !"#$ " "#$ ! !#$ % !% !!#$ !! !"#$ " "#$ ! !#$ % &'!"

!(

)!*+,-"%!"!./!*%'0'1!*23 )-!*+,/!*%.-"%!"!.'0'1!*2/%+,*23 )!*+,-"!!"%./!*%'0'!1!*23 )-!*+,/!*%.-"!!"%.'0'!1!*2!%+,*23 4562'7859:2';:<-=:'7:.*2 >?@9,2'A95B;'=?C65:2'-=.

C2 C1 C2 C1

1 1 e e

Superconducting SET

Josephson quasi particle cycle

−1 −0.5 0.5 1 1.5 2 −2 −1.5 −1 −0.5 0.5 1 1.5 2 x 10

−3

[κ2(1/2+∆/Ec)−1| 2∆/e + Ec/e] [κ2(3/2+∆/Ec)−1 | 2∆/e + 3Ec/e] [−κ1(1/2+∆/Ec)+1 | 2∆/e + Ec/e] [−κ1(3/2+∆/Ec)+1 | 2∆/e + 3Ec/e] [κ2(1/2+∆/Ec)−1 | −2∆/e − Ec/e] [κ2(3/2+∆/Ec)−1 | −2∆/e − 3Ec/e] [−κ1(1/2+∆/Ec)+1 | −2∆/e − Ec/e] [−κ1(3/2+∆/Ec)+1 | −2∆/e − 3Ec/e] Gate Charge ng=(Vg Cg)/e

C2 C1 C2 C1

2 2 1 2e e

C2 C1

1 e

Superconducting RF-SET