Rotational quantum tunneling of a pinned-magnetization nano-particle in a superconducting trap is protected against rest-gas decoherence by near-perfect axial symmetry and lies within experimentally accessible parameter ranges.
The relevant phonon wavelength at the tunneling frequency and typical librational frequencies is much larger than the size of the trap
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Rotational Quantum Tunneling of a Magnetic Dipole in a Superconducting Trap
Rotational quantum tunneling of a pinned-magnetization nano-particle in a superconducting trap is protected against rest-gas decoherence by near-perfect axial symmetry and lies within experimentally accessible parameter ranges.