Hybrid quantum magnetism in circuit QED: from spin-photon waves to many-body spectroscopy.
Hybrid quantum magnetism in circuit QED: from spin-photon waves to many-body spectroscopy.
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DOI：
10.1103/physrevlett.112.180405
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发表时间：
2013-10
影响因子：
8.6
通讯作者：
A. Kurcz;A. Bermudez;J. García-Ripoll
中科院分区：
文献类型：
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作者：
A. Kurcz;A. Bermudez;J. García-Ripoll
我们介绍了一个模型的量子磁性诱导的微波光子之间的非微扰交换遥远的超导量子比特。通过将量子比特和腔体相互连接，我们得到了一个自旋玻色子晶格模型，该模型表现出量子比特和腔体自发地相互作用的量子相变。我们提出了一个多体的anomaly，捕捉这种现象的所有方式，从微扰色散制度，光子可以追溯到非微扰的超强耦合制度，光子必须在相同的基础上对待量子比特。我们的分析还再现了低能量激发，这是由杂化自旋光子准粒子描述，并可以从电路QED的传输实验中探测光谱，如通过矩阵乘积态方法模拟可能的实验所示。
We introduce a model of quantum magnetism induced by the nonperturbative exchange of microwave photons between distant superconducting qubits. By interconnecting qubits and cavities, we obtain a spin-boson lattice model that exhibits a quantum phase transition where both qubits and cavities spontaneously polarize. We present a many-body ansatz that captures this phenomenon all the way, from a the perturbative dispersive regime where photons can be traced out, to the nonperturbative ultrastrong coupling regime where photons must be treated on the same footing as qubits. Our ansatz also reproduces the low-energy excitations, which are described by hybridized spin-photon quasiparticles, and can be probed spectroscopically from transmission experiments in circuit QED, as shown by simulating a possible experiment by matrix-product-state methods.