Measurement of the Berry Phase in a Single Solid-State Spin Qubit

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We present measurements of the Berry Phase in a single solid-state spin qubit associated with the nitrogen-vacancy center in diamond.

• Our results demonstrate the remarkable degree of coherent control achievable in the presence of a highly complex solid-state environment.
• We manipulate the spin qubit geometrically by careful application of microwave radiation that creates an effective rotating magnetic field, and observe the resulting phase via spin-echo interferometry.
• We find good agreement with Berry's predictions within experimental errors.