Many quantum applications require spectral multiplexed control to achieve the targeted high performances: for example, large band radiofrequency sensing and processing, high fidelity for quantum memories, or multi-qubits for quantum computing. We will discuss the main challenge involved by the spectral multiplexing: generating complex optical waveforms in VIS/NIR range. We will then focus in particular on rare earth ions, as they naturally offer a large inhomogeneous linewidth, tailorable by spectral hole burning, and discuss how to maintain the coherence of rare earth doped materials at cryogenic temperature under large band optical programming.
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