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Figure 4 | EPJ Quantum Technology

Figure 4

From: Quantum metamaterials in the microwave and optical ranges

Figure 4

Classical and quantum phase transition in the state of photons in a 1D superconducting quantum metamaterial [ 26 ]. The photon order parameter \(P_{0}(\tau)\) as a function of imaginary time τ is either constant (classical phase transition, red line, \(P_{0} \propto N\)) or proportional to \(\sin[P_{0}(T) \tau]\) (quantum phase transition, blue line, \(P \propto N^{1/3}\)). The low disorder case is shown: \(\Delta_{k} \approx\Delta_{0} = 4\)K; \(T^{\star}_{n} = 20\)K.

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