Kavli Affiliate: Andrei Faraon
| First 5 Authors: Alexey Tiranov, Emanuel Green, Sophie Hermans, Erin Liu, Federico Chiossi
| Summary:
Optically addressable solid-state spins have been extensively studied for
quantum technologies, offering unique advantages for quantum computing,
communication, and sensing. Advancing these applications is generally limited
by finding materials that simultaneously provide lifetime-limited optical and
long spin coherences. Here, we introduce $^{171}$Yb$^{3+}$ ions doped into a
CaWO$_4$ crystal. We perform high-resolution spectroscopy of the excited state,
and demonstrate all-optical coherent control of the electron-nuclear spin
ensemble. We find narrow inhomogeneous broadening of the optical transitions of
185 MHz and radiative-lifetime-limited coherence time up to 0.75 ms. Next to
this, we measure a spin-transition ensemble line width of 5 kHz and
electron-nuclear spin coherence time reaching 0.15 seconds at zero magnetic
field between 50 mK and 1 K temperatures. These results demonstrate the
potential of $^{171}$Yb$^{3+}$:CaWO$_4$ as a low-noise platform for building
quantum technologies with ensemble-based memories, microwave-to-optical
transducers, and optically addressable single-ion spin qubits.
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