Simulations predict that Er3+ electron spins in CeO2 can reach second-scale Hahn-echo coherence at ~10 ppb doping and sub-Kelvin temperatures near clock transitions, with ~10 ms expected at 2 K.
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Towards second-long electron spin coherence of a telecom quantum emitter in naturally abundant CeO$_2$
Simulations predict that Er3+ electron spins in CeO2 can reach second-scale Hahn-echo coherence at ~10 ppb doping and sub-Kelvin temperatures near clock transitions, with ~10 ms expected at 2 K.