Physics – Quantum Physics
Scientific paper
2001-02-18
Physics
Quantum Physics
4 pages. More information and publications at http://www.ece.rochester.edu:8080/users/sde/research/publications/index.html
Scientific paper
We introduce a technique to control the macroscopic quantum state of an rf SQUID qubit. We propose to employ a stream of single flux quantum (SFQ) pulses magnetically coupled to the qubit junction to momentarily suppresses its critical current. This effectively lowers the barrier in the double-well rf-SQUID potential thereby increasing the tunneling oscillation frequency between the wells. By carefully choosing the time interval between SFQ pulses one may accelerate the interwell tunneling rate. Thus it is possible to place the qubit into a chosen superposition of flux states and then effectively to freeze the qubit state. We present both numerical simulations and analytical time-dependent perturbation theory calculations that demonstrate the technique. Using this strategy one may control the quantum state of the rf-SQUID in a way analogous to the \pi pulses in other qubit schemes. Research supported in part by ARO grant # DAAG55-98-1-0367.
Bocko Mark F.
Feldman Marc J.
Habif Jonathan L.
Zhou Xingxiang
No associations
LandOfFree
A "Tipping Pulse" Scheme for rf-SQUID Qubits does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A "Tipping Pulse" Scheme for rf-SQUID Qubits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A "Tipping Pulse" Scheme for rf-SQUID Qubits will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-212692