Flux avalanche in thin superconducting film with internal crack

Improving the steady-state coherence and entanglement of two coupled qubits via composite system-reservoir interactions

“…Previous studies [43] have shown that the SSC of two interacting qubits coupled to two independent heat reservoirs in the eigenstate representation cannot be acquired when the secular approximation is adopted. In contrast, avoiding the secular approximation can achieve the SSC in a non-equilibrium environment [53]. However, in a certain temperature range, the SSE can be generated in both cases, and the SSE can be enhanced by changing the energy detuning between the two qubits [54,57].…”

“…However, in practical applications, for an open quantum system, the more general case is the non-equilibrium environment. In recent years, the study of the steady-state quantum properties of open quantum systems in non-equilibrium environments has attracted extensive attention and become a topical field [22][23][24][25][26][51][52][53][54][55][56][57][58][59][60][61]. In particular, for a two-qubit system, the steadystate entanglement (SSE) [56][57][58][59][60][61] and coherence (SSC) [51][52][53][54][55] have been investigated in various environments.…”

“…In recent years, the study of the steady-state quantum properties of open quantum systems in non-equilibrium environments has attracted extensive attention and become a topical field [22][23][24][25][26][51][52][53][54][55][56][57][58][59][60][61]. In particular, for a two-qubit system, the steadystate entanglement (SSE) [56][57][58][59][60][61] and coherence (SSC) [51][52][53][54][55] have been investigated in various environments. For example, In [54], the authors have studied the SSE and SSC of two coupled qubits in a non-equilibrium environment.…”

“…Motivated by this observation, in this work, we investigate the improvement of SSC and SSE of two coupled qubits by means of composite system-reservoir interaction constructed by a linear combination of orthogonal and parallel ones. Since in the absence of parallel components, the SSC of the two-qubit system can be obtained due to the inter-qubit interaction [51][52][53][54][55]. Here, we mainly explore the effects of the parallel components of the interaction Hamiltonian on the SSE and SSC focusing on the non-equilibrium environment.…”

Tunable domino effect of thermomagnetic instabilities in superconducting films with multiply-connected topological structures

“…These catastrophic events can be directly observed via magneto-optical imaging (MOI) technique, as demonstrated in several superconducting materials, such as Nb [5,6], MgB 2 [1,7], YBCO [8][9][10], Nb 3 Sn [11], Pb [12], NbN [13], Mo 3 Ge [14], as well as a-MoSi thin film [15]. The effect of controllable space modulations of the superconducting state in this event can be accomplished mainly by inserting artificial arrays of holes, cracks, and additional conducting layers in the superconducting systems [16][17][18][19][20][21].…”