Figure 1: Geometric operation and experimental sequence. | Nature Communications

Figure 1: Geometric operation and experimental sequence.

From: Geometric spin echo under zero field

Figure 1

(a) Energy level diagram of an electron spin in an NV centre under a zero magnetic field on the computational bases. (b) The logical bases are transformed into bright and dark states, as defined by the microwave polarization. (c) Bloch sphere representation of a 2π rotation starting from the bright state through the ancillary state returning to with an additional geometric phase factor −1. The geometric phase contributes to a π rotation around the axis in the logical qubit space. (d) Pulse sequence used for the Rabi oscillation, Ramsey interference, and echo recovery. Insets illustrate the logical qubit dephasing and refocusing after the 2π pulse.

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