Quantum memory with millisecond coherence in circuit QED
Quantum memory with millisecond coherence in circuit QED
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DOI：
10.1103/physrevb.94.014506
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发表时间：
2016-07-08
影响因子：
3.7
通讯作者：
Schoelkopf, Robert J.
中科院分区：
文献类型：
--
作者：
Reagor, Matthew;Pfaff, Wolfgang;Schoelkopf, Robert J.
相干性方面的重大进步使超导量子电路成为容错量子计算的可行平台。为了进一步扩展功能，高度相干的量子系统可以充当这些电路的量子存储器。有用的量子存储器必须能够通过基于约瑟夫森结的人造原子快速寻址，同时保持卓越的相干性。我们展示了一种超导微波腔体架构，该架构对于电路 QED 系统工程中遇到的主要损耗源具有高度鲁棒性。该架构允许在谐振器中以毫秒级存储量子叠加，而谐振器和传输量子位之间的强耦合可以实现 MHz 速率的控制、编码和读出。与早期硬件相比，这将超导电路中可达到的最大可用相干时间延长了几乎一个数量级。我们的设计是研究相干量子光学的理想平台，标志着基于约瑟夫森结的量子电路中硬件高效量子计算的重要一步。
Significant advances in coherence render superconducting quantum circuits a viable platform for fault-tolerant quantum computing. To further extend capabilities, highly coherent quantum systems could act as quantum memories for these circuits. A useful quantum memory must be rapidly addressable by Josephson-junction-based artificial atoms, while maintaining superior coherence. We demonstrate a superconducting microwave cavity architecture that is highly robust against major sources of loss that are encountered in the engineering of circuit QED systems. The architecture allows for storage of quantum superpositions in a resonator on the millisecond scale, while strong coupling between the resonator and a transmon qubit enables control, encoding, and readout at MHz rates. This extends the maximum available coherence time attainable in superconducting circuits by almost an order of magnitude compared to earlier hardware. Our design is an ideal platform for studying coherent quantum optics and marks an important step towards hardware-efficient quantum computing in Josephson-junction-based quantum circuits.