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A: Fachverband Atomphysik
A 19: Ultra-Cold Plasmas and Rydberg System
A 19.7: Vortrag
Donnerstag, 11. März 2010, 12:15–12:30, B 302
Controlled qubit rotation using Rydberg level shifts — •Ulrich Krohn, Richard Abel, Christopher Carr, and Charles Adams — Atomic and Molecular Physics, Durham University, Durham, United Kingdom
We study the transfer of the population between two ground states in 87Rb controlled by an electro-magnetically induced transparency (EIT) resonance. The system used is well described by a four level atom with two ground states coupled by two phase stabilised laser fields 1 to an intermediate state. A Rydberg state is coupled via Ωr with a detuning δr to the intermediate state. With Ωr = 0 the population is transported from one ground state to the other by means of a π-Raman pulse. This transfer is blocked if Ωr≠ 0, δr=0 as the two photon resonance is lifted by EIT.
The population transfer can be unblocked by shifting the Rydberg level out of laser resonance using an electric field or the interaction of other Rydberg atoms with the dark state of the EIT resonance 2, 4. Given a narrow band excitation laser, e.g. 3, this scheme can be used to implement a single site addressability in an optical lattice when replacing the electric field with an electric field gradient.
References
| 1 | RP Abel, et al., Optics Letters 34, 3071 (2009) |
| 2 | M Müller, et al., PRL 102, 170502 (2009) |
| 3 | RP Abel, et al., Appl. Phys. Lett. 94, 071107 (2009) |
| 4 | JD Pritchard, et al., arXiv:0911.3523v2 (2009) |