The effectiveness of decoherence suppression schemes is explored using quantum bits (qubits) stored in Li np Rydberg states. Following laser excitation, pulsed electric fields coherently control the electronic spin-orbit coupling, facilitating qubit creation, manipulation, and measurement. Spin-orbit coupling creates an approximate decoherence-free subspace for extending qubit storage times. However, sequences of fast NOT operations are found to be substantially more effective for preserving coherence.
We have investigated multiphoton transitions driven by two harmonically related microwave fields in a two-level system. We observed pronounced dependence of the Rabi frequency on the amplitudes and relative phase of the fields in the low field limit and found that the Rabi frequency of the combined fields was given by the phasor sum of the Rabi frequencies of the individual fields. For strong fields, each individual Rabi frequency is modified by the presence of the other field and this intuitive phasor addition is no longer valid.
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