* PHYSICS/BK21 SEMINAR *

normal>Many-qubit interactions in superconducting flux qubits

Centre
for Modern Physics and Department of Physics, Chongqing
University, w:st=on>Chongqing 400044, The People’s Republic of
China

연사
: Sam
Young Cho

일시
: 물리학과 세미나실 (공학3동 201호)

일시
: 7월 11일 (수요일)  오전 11:00 - 12:30

normal>Abstract

The last decade has seen rapidly developing advanced material
technologies. It is possible to investigate previously inaccessible quantum systems
for quantum information and computation in solid-state systems. Especially,
coherent manipulation of quantum states in tunable superconducting devices has
enabled to demonstrate macroscopic qubits and entangled states of qubits.
Experimentally, it has been shown that, in terms of pseudo-spins, a different type
of exchange interactions between two artificial-spins such as an Ising
interaction for charge qubits and flux qubits and an XY interaction for phase
qubits, can be realized and controlled by the system parameters. In this talk,
I will discuss, in a general framework, how artificial-multiple spin
interactions are possible and realizable in superconducting qubit systems. In
fact, flux qubit systems are shown to have an intrinsic property which is
multiple artificial-spin interactions. Accordingly, flux qubit systems enable
to study various artificial-spin systems corresponding to many-body systems
unlikely found naturally. Finally, I will discuss the ranges of system
parameters to generate the Bell
states for two flux qubits, and the 10.0pt;font-family:CMR10;mso-bidi-font-family:CMR10;mso-font-kerning:0pt>Greenberger-Horne-Zeilinger
(GHZ) state and the W state for three flux qubits.