Type II Quantum Computing With Superconductors
Final rept. 1 Jul 2001-31 Mar 2004
MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
Pagination or Media Count:
The results of this research centered on the experimental studies of a single superconducting persistent current qubit, the implementation of type-II algorithms using these qubits, and the proposal for adiabatic quantum computing using these qubits. The major experimental results on single superconducting persistent current qubits have been the observation of the quantum energy level crossings in niobium qubits, and the microwave measurements of intra-well relaxation times. We have developed two implementation methods for solving the one-dimensional diffusion equation with a type-II algorithm. In the first method, the state of each qubit is set by the local magnetic field bias. Although this initialization method has the advantage of simplicity, the subsequent unitary collision operations demand precise timing. The second method uses nearly identical qubits that can be addressed locally at the node. Microwave pulses are then used for the initialization, and the unitary transformation is simplified to just timed free propagation. A scalable architecture for an adiabatic quantum computer has been proposed for superconducting persistent current qubits in which an adiabatically varying magnetic field is applied to all the qubits simultaneously.
- Electricity and Magnetism
- Quantum Theory and Relativity