TY - GEN
T1 - Superconducting quantum bit with ferromagnetic π-junction
AU - Yamashita, T.
AU - Takahashi, S.
AU - Maekawa, S.
PY - 2006
Y1 - 2006
N2 - We propose a new qubit consisting of a superconducting ring with an ordinary Josephson junction and a ferromagnetic π-junction. In the system, two degenerate stable states appear in the phase space without an external magnetic field due to a competition between the 0- and π-states. Because of quantum tunneling between the two degenerate states, bonding and antibonding states, which are used as a bit, are formed. For manipulating the states of the qubit, only small external magnetic field around zero is required. This feature leads to a large-scale integration and a construction of the qubit with a smaller size which is robust to decoherence by external noises.
AB - We propose a new qubit consisting of a superconducting ring with an ordinary Josephson junction and a ferromagnetic π-junction. In the system, two degenerate stable states appear in the phase space without an external magnetic field due to a competition between the 0- and π-states. Because of quantum tunneling between the two degenerate states, bonding and antibonding states, which are used as a bit, are formed. For manipulating the states of the qubit, only small external magnetic field around zero is required. This feature leads to a large-scale integration and a construction of the qubit with a smaller size which is robust to decoherence by external noises.
KW - Ferromagnet/superconductor hybrid structures
KW - Josephson effect
KW - Quantum computing
UR - http://www.scopus.com/inward/record.url?scp=84903843094&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84903843094&partnerID=8YFLogxK
U2 - 10.1142/9789812773210_0020
DO - 10.1142/9789812773210_0020
M3 - Conference contribution
AN - SCOPUS:84903843094
SN - 9812568581
SN - 9789812568588
T3 - Proceedings of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005
SP - 84
EP - 87
BT - Proceedings of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005
PB - World Scientific Publishing Co. Pte Ltd
T2 - 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005
Y2 - 22 August 2005 through 25 August 2005
ER -