Hybrid Qubit gates in circuit QED: A scheme for quantum bit encoding and information processing
M. C. de Oliveira · arXiv (Cornell University) · 2011
Institute for Quantum Information Science, University of Calgary, Alberta T2N 1N4, Canada(Dated: October 7, 2011)Solid state superconducting devices coupled to coplanar transmission lines offer an exquisite architecturefor quantum optical phenomena probing as well as for quantum computation implementation, being the objectof intense theoretical and experimental investigation lately. In appropriate conditions the transmission lineradiation modes can get strongly coupled to a superconducting device with only two levels -for that reason calledartificial atom or qubit. Employing this system we propose a hybrid two-quantum bit gate encoding involvingquantum electromagnetic field qubit states prepared in a coplanar transmission line capacitively coupled to asingle charge qubit. Since dissipative effects are more drastic in the solid state qubit than in the field one, itcan be employed for storage of information, whose efficiency against the action of an ohmic bath show that thisencoding can be readily implemented with present day technology. We extend the investigation to generateentanglement between several solid state qubits and the field qubit through the action of external classicalmagnetic pulses.