论文标题
在两腿超导电路上的合成量规场和手性物理
Synthetic gauge field and chiral physics on two-leg superconducting circuits
论文作者
论文摘要
量规场对于探索现代物理学中的新现象至关重要。然而，在最近的突破性实验中，它尚未实现，涉及带有Transmon Qubits的两腿超导电路[Phys。莱特牧师。 123，050502（2019）]。在这里，我们提出了一种实验性可行的方法，可以通过在每个量子位中引入AC微波驾驶来实现合成量规场。特别是，可以通过正确选择驾驶阶段来独立调整所实现的有效磁通量。此外，获得了单季度和双Quition激励的地下手性电流，并发现了Meissner-vortex相变。在Meissner阶段，地下手性电流随着磁通量的增加而增加，而在涡流期下降。另外，还揭示了至关重要的取决于系统初始状态的手性动力学。最后，解决了手性电流和动力学的可能实验观察结果。因此，我们的结果为探索量规场的相互作用，两腿跳和光子在超导电路上的相互作用引起的新型多体性能提供了新的途径。
Gauge field is essential for exploring novel phenomena in modern physics. However, it has not been realized in the recent breakthrough experiment about two-leg superconducting circuits with transmon qubits [Phys. Rev. Lett. 123, 050502 (2019)]. Here we present an experimentally-feasible method to achieve the synthetic gauge field by introducing ac microwave driving in each qubit. In particular, the effective magnetic flux per plaquette achieved can be tuned independently by properly choosing the driving phases. Moreover, the ground-state chiral currents for the single- and two-qubit excitations are obtained and the Meissner-vortex phase transition is found. In the Meissner phase, the ground-state chiral current increases as the magnetic flux increases, while it decreases in the vortex phase. In addition, the chiral dynamics that depends crucially on the initial state of the system is also revealed. Finally, the possible experimental observations of the chiral current and dynamics are addressed. Therefore, our results provide a new route to explore novel many-body properties induced by the interplay of gauge field, two-leg hoppings and interaction of photons on superconducting circuits.
