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arXiv 1402.6847cond-mat.mes-hallcond-mat.str-elquant-ph
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分数量子霍尔态的诱导自稳定性

Induced self-stabilization in fractional quantum Hall states of light

Eliot Kapit, Mohammad Hafezi, Steven H. Simon

摘要:

最近在纳米量子光学和超导量子比特方面的进展使得创造强相关的,甚至拓扑有序的光子态成为可能。这些状态中的许多是带隙的,并且表现出任意子激发,这可以用于量子信息处理的鲁棒形式。然而,虽然存在许多量子位阵列建议来设计这些系统的哈密顿量,但如何稳定这些光子量子模拟器的多体基态以防止光子损失的问题仍然在很大程度上没有答案。我们在这里提出了一个简单的机制,实现这一目标的阿贝尔和非阿贝尔分数量子霍尔态的光。我们的构造使用均匀的双光子驱动场将主晶格的量子位与辅助的“阴影”晶格耦合,该晶格由比主量子模拟器本身的量子位损失率快得多的量子位组成。这种耦合导致光子损失所产生的空穴态被迅速地重新填充,并且一旦达到强关联的基态,系统的多体能隙就阻止进一步的光子被添加。分数量子霍尔态(具有少量的准空穴激发的瞬态人口)因此是系统最稳定的状态,所有其他配置将随着时间的推移向它弛豫。这里描述的物理可以在电路QED架构中实现,并且我们的方案成功所需的器件参数在当前技术范围内。我们还提出了一个简单的6量子比特设备,它可以在不久的将来很容易地构建,可以作为我们方案的原理证明。

英文摘要:

Recent progress in nanoscale quantum optics and superconducting qubits has made the creation of strongly correlated, and even topologically ordered, states of photons a real possibility. Many of these states are gapped and exhibit anyon excitations, which could be used for a robust form of quantum information processing. However, while numerous qubit array proposals exist to engineer the Hamiltonian for these systems, the question of how to stabilize the many-body ground state of these photonic quantum simulators against photon losses remains largely unanswered. We here propose a simple mechanism which achieves this goal for abelian and non-abelian fractional quantum Hall states of light. Our construction uses a uniform two-photon drive field to couple the qubits of the primary lattice with an auxiliary ``shadow" lattice, composed of qubits with a much faster loss rate than the qubits of the primary quantum simulator itself. This coupling causes hole states created by photon losses to be rapidly refilled, and the system's many-body gap prevents further photons from being added once the strongly correlated ground state is reached. The fractional quantum Hall state (with a small, transient population of quasihole excitations) is thus the most stable state of the system, and all other configurations will relax toward it over time. The physics described here could be implemented in a circuit QED architecture, and the device parameters needed for our scheme to succeed are in reach of current technology. We also propose a simple 6 qubit device, which could easily be built in the near future, that can act as a proof of principle for our scheme.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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