超导铝腔的单光子寿命达到10ms
Reaching 10 ms single photon lifetimes for superconducting aluminum cavities
摘要：
三维微波腔最近已经与超导量子比特结合在电路量子电动力学（cQED）架构中。这些腔应该对表面和界面处的介电和导体损耗具有较低的灵敏度，这目前限制了平面谐振器的性能。我们预计，3D结构应该可以实现显著（>10^3）更高的品质因数和更长的寿命。基于这一原理，我们在单光子能量和毫开尔文温度下获得了大于0.5 × 10^9的内部品质因数和0.01秒的本征寿命。这些改进可以使长寿命的量子存储器在与超导量子位强耦合时具有亚微秒的访问时间。
英文摘要：
Three-dimensional microwave cavities have recently been combined with superconducting qubits in the circuit quantum electrodynamics (cQED) architecture. These cavities should have less sensitivity to dielectric and conductor losses at surfaces and interfaces, which currently limit the performance of planar resonators. We expect that significantly (>10^3) higher quality factors and longer lifetimes should be achievable for 3D structures. Motivated by this principle, we have reached internal quality factors greater than 0.5x10^9 and intrinsic lifetimes of 0.01 seconds for multiple aluminum superconducting cavity resonators at single photon energies and millikelvin temperatures. These improvements could enable long lived quantum memories with submicrosecond access times when strongly coupled to superconducting qubits.
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