Quantum simulation of the spin-boson model with a microwave circuit
Quantum simulation of the spin-boson model with a microwave circuit
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DOI：
10.1103/physreva.97.052321
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发表时间：
2017-11
影响因子：
2.9
通讯作者：
J. Leppakangas;Jochen Braumuller;Melanie Hauck;Jan-Michael Reiner;I. Schwenk;S. Zanker;Lukas Fritz;A. Ustinov;M. Weides;M. Marthaler
中科院分区：
文献类型：
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作者：
J. Leppakangas;Jochen Braumuller;Melanie Hauck;Jan-Michael Reiner;I. Schwenk;S. Zanker;Lukas Fritz;A. Ustinov;M. Weides;M. Marthaler
我们考虑超导电路是为了模拟自旋玻色子模型。自旋玻色子模型由与玻色子模式耦合的单个两能级系统组成。在大多数情况下，该模型被认为处于极限状态，其中玻色子模式足够密集以形成连续的光谱浴。一个众所周知的例子是欧姆浴，其中态密度随频率线性增长。在弱耦合或大温度的限制下，这个问题可以通过数值求解。如果耦合很强，玻色子模式就会变得足够兴奋，从而使经典模拟变得不可能。在这里，我们讨论如何通过将超导量子位耦合到一组微波谐振器来执行该问题的量子模拟。我们演示了连续光谱浴的可能实现，其中各个浴谐振器与量子位强耦合。应用微波驱动方案可能使我们能够访问自旋玻色子模型的强耦合机制。我们讨论了如何通过电路量子电动力学的标准量子位读出技术来探测不同初始化条件下产生的自旋弛豫动力学。
We consider superconducting circuits for the purpose of simulating the spin-boson model. The spin-boson model consists of a single two-level system coupled to bosonic modes. In most cases, the model is considered in a limit where the bosonic modes are sufficiently dense to form a continuous spectral bath. A very well known case is the Ohmic bath, where the density of states grows linearly with the frequency. In the limit of weak coupling or large temperature, this problem can be solved numerically. If the coupling is strong, the bosonic modes can become sufficiently excited to make a classical simulation impossible. Here we discuss how a quantum simulation of this problem can be performed by coupling a superconducting qubit to a set of microwave resonators. We demonstrate a possible implementation of a continuous spectral bath with individual bath resonators coupling strongly to the qubit. Applying a microwave drive scheme potentially allows us to access the strong-coupling regime of the spin-boson model. We discuss how the resulting spin relaxation dynamics with different initialization conditions can be probed by standard qubit-readout techniques from circuit quantum electrodynamics.