Controllable coherent population transfers in superconducting qubits for quantum computing

Details Controllable coherent population transfers in superconducting qubits for quantum computing Controllable coherent population transfers in superconducting qubits for quantum computing

2008-01-29

arxiv.org/abs/0801.4417v1

Phys. Rev. Lett. 100, 113601 (2008)

Physics

Quantum Physics

4 pages, 6 figures. to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.100.113601

We propose an approach to coherently transfer populations between selected quantum states in one- and two-qubit systems by using controllable Stark-chirped rapid adiabatic passages (SCRAPs). These {\it evolution-time insensitive} transfers, assisted by easily implementable single-qubit phase-shift operations, could serve as elementary logic gates for quantum computing. Specifically, this proposal could be conveniently demonstrated with existing Josephson phase qubits. Our proposal can find an immediate application in the readout of these qubits. Indeed, the broken parity symmetries of the bound states in these artificial "atoms" provide an efficient approach to design the required adiabatic pulses.

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