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EPJ Quantum Technology
Figure 2 | EPJ Quantum Technology

Figure 2

From: A similarity of quantum phase transition and quench dynamics in the Dicke model beyond the thermodynamic limit

Figure 2

(a) Schematic of N identical NV centers located near a current-carrying nanotube, and there has no direct interaction between arbitrary two driven NV centers. I is the electric current and B is the magnetic field in the nanotube. d is the distance between the nanotube and NV centers, and varies when the nanotube vibrates. The blue-dot line represents the other NV centers. (b) Level configuration of each driven NV center. u is the driving of external microwave field and Δ is the symmetric detuning

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