Abstract
Ensembles of dopants have widespread applications in quantum technology. The miniaturization of corresponding devices is however hampered by dipolar interactions that reduce the coherence at increased dopant density. We theoretically and experimentally investigate this limitation. We find that dynamical decoupling can alleviate, but not fully eliminate, the decoherence in crystals with strong anisotropic spin-spin interactions that originate from an anisotropic g tensor. Our findings can be generalized to many quantum systems used for quantum sensing, microwave-to-optical conversion, and quantum memory.
Highlights
Ensembles of dopants have widespread applications in quantum technology
In this Letter, we theoretically and experimentally investigate to which degree this limitation can be overcome by dynamical decoupling (DD)
We investigate if the coherence time can be increased by DD, where a sequence of control pulses drives the spins along a path in which the interaction Hamiltonian with the environment cancels to first order [34]
Summary
Ensembles of dopants have widespread applications in quantum technology. The miniaturization of corresponding devices is hampered by dipolar interactions that reduce the coherence at increased dopant density. We investigate if the coherence time can be increased by DD, where a sequence of control pulses drives the spins along a path in which the interaction Hamiltonian with the environment cancels to first order [34].
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