Multiphoton coherent manipulation in large-spin qubits

TL;DR

This paper demonstrates the coherent control of large-spin Mn2+ ions in a crystal, enabling multi-photon Rabi oscillations and tunable level configurations, which could advance multi-level quantum information processing.

Contribution

It introduces a method to manipulate large-spin qubits with tunable anisotropy and suppressed decoherence, expanding quantum control capabilities in solid-state systems.

Findings

Successful realization of multi-photon Rabi oscillations in a six-level spin system

Reversible tuning of the system between harmonic and non-harmonic levels

Decoherence effects are significantly suppressed due to quasi-isotropic interactions

Abstract

Large spin Mn2+ ions (S=5/2) diluted in a non-magnetic MgO matrix of high crystalline symmetry are used to realize a six level system that can be operated by means of multi-photon coherent Rabi oscillations. This spin system has a very small anisotropy which can be tuned in-situ to reversibly transform the system between harmonic and non-harmonic level configurations. Decoherence effects are strongly suppressed as a result of the quasi-isotropic electron interaction with the crystal field and with the 55Mn nuclear spins. These results suggest new ways of manipulating, reading and resetting spin quantum states which can be applied to encode a qubit across several quantum levels.