Quantum Information with Solid-State Devices

VO 141.A55SS2016

Dr. Johannes Majer

Lecture 9

RF-SQUID

RF-SQUID

Fluxonium

Phase Qubit

Phase Qubit

persistent-current qubit

φ1

φ2

f=0 α=0.8

−8 −6 −4 −2 0 2 4 6 8

−8

−6

−4

−2

0

2

4

6

8 −2.5

−2

−1.5

−1

−0.5

0

0.5

1

f=0

persistent-current qubit

φ1

φ2

f=0.5 α=0.8

−8 −6 −4 −2 0 2 4 6 8

−8

−6

−4

−2

0

2

4

6

8−1

−0.5

0

0.5

1

1.5

2

2.5

f=0.5

persistent-current qubit

−4 −3 −2 −1 0 1 2 3 4−2

−1.5

−1

−0.5

0

0.5

1

1.5

2

2.5

3

φ1=−φ2

Ener

gy (E

J)α=0.8

f=0.5f=0.55f=0.45

persistent-current qubit

persistent-current qubit

persistent-current qubit

persistent-current qubit

persistent-current qubit

persistent-current qubit

persistent-current qubit

persistent-current qubit

persistent-current qubit

persistent-current qubit

persistent-current qubit