Spin-Orbit Qubits of Rare-Earth-Metal Ions in Axially Symmetric Crystal Fields

Abstract

Contrary to the well known spin qubits, rare-earth qubits are characterized by a strong influence of crystal field due to large spin-orbit coupling. At low temperature and in the presence of resonance microwaves, it is the magnetic moment of the crystal-field ground-state which nutates (for several $\mu$s) and the Rabi frequency ${\Omega }_R$ is anisotropic. Here, we present a study of the variations of ${\Omega }_R({\vec{H}}_0)$ with the magnitude and direction of the static magnetic field $\overrightarrow{H_0}$ for the odd ${}^{167}$Er isotope in a single crystal CaWO${}_4$:Er${}^{3+}$. The hyperfine interactions split the ${\Omega }_R({\vec{H}}_0)$ curve into eight different curves which are fitted numerically and described analytically. These "spin-orbit qubits" should allow detailed studies of decoherence mechanisms which become relevant at high temperature and open new ways for qubit addressing using properly oriented magnetic fields.

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Cited by in corpus (20)

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• Quantum simulations and experiments on Rabi oscillations of spin qubits: intrinsic {\sl vs} extrinsic damping
• Strong coupling of an Er3+ doped YAlO3 crystal to a superconducting resonator
• Decoherence window and electron-nuclear cross-relaxation in the molecular magnet V 15
• Extreme field-sensitivity of the magnetic tunneling in Fe-doped Li${}_3$N
• Experimental protection of quantum coherence by using a phase-tunable image drive
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• Tunable multi-photon Rabi oscillations in an electronic spin system
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• Dielectric Properties of Single Crystal Calcium Tungstate