Abstract: A molecular-spin qubit is formed from a coordination complex having a plurality of strong-field ligands bound to a metal-atom center. The ground state has non-zero spin, and the resulting ground-state magnetic sublevels are separated by microwave or millimeter-wave frequencies, even in the absence of an external field. Two of these sublevels may be used as a quantum resource for quantum information processing, quantum communication, quantum memory, sensing, and other applications. Optical pumping to an excited state may be used to spin-polarize the molecular-spin qubit, and to measure its population by detecting photoluminescence. The energy-level structure of the metal-atom center can be modified due to its interaction with the ligands, therefore allowing the molecular-spin qubit to be “chemically tuned” based on the number and type of ligands. Ensembles of these molecular-spin qubits can be controllably deposited on a surface, or otherwise integrated into devices and structures.

Abstract: Methods and devices are disclosed for implementing quantum information processing based on electron spins in semiconductor and transition metal compositions. The transition metal electron orbitals split under semiconductor crystal field. The electron ground states are used as qubits. The transitions between the ground states involve electron spin flip. The semiconductor and transition metal compositions may be further included in optical cavities to facilitate quantum information processing. Quantum logic operations may be performed using single color or two color coherent resonant optical excitations via an excited electron state.

Abstract: Methods and devices are disclosed for implementing quantum information processing based on electron spins in semiconductor and transition metal compositions. The transition metal electron orbitals split under semiconductor crystal field. The electron ground states are used as qubits. The transitions between the ground states involve electron spin flip. The semiconductor and transition metal compositions may be further included in optical cavities to facilitate quantum information processing. Quantum logic operations may be performed using single color or two color coherent resonant optical excitations via an excited electron state.

Abstract: Methods and devices are disclosed for implementing quantum information processing based on electron spins in semiconductor and transition metal compositions. The transition metal electron orbitals split under semiconductor crystal field. The electron ground states are used as qubits. The transitions between the ground states involve electron spin flip. The semiconductor and transition metal compositions may be further included in optical cavities to facilitate quantum information processing. Quantum logic operations may be performed using single color or two color coherent resonant optical excitations via an excited electron state.