Figure 1
From: Rebuilding of destroyed spin squeezing in noisy environments
(a) A pulse sequence used to effectively generate TAT from OAT at zero magnetic field. The red (green) bars with Y (\(\bar{Y}\)) represent a π/2 pulse around y (−y) axis. The system evolves freely between pulses. T c is the cycle period. (b) A CDD pulse sequence used to suppress the stray magnetic fields for driven-OAT. The purple (blue, black) bars with x (y, z) represent a π pulse around x (y, z) axis. (c) Spin squeezing for OAT (grey dashed line), TAT (grey solid line), and driven-OAT with χT c = 4 × 10−4 (green triangles), 2 × 10−4 (blue squares), and 1 × 10−4 (red circles). As T c decreases, the driven-OAT approaches to the TAT.
