Superconducting qubits consisting of epitaxially grown NbN/AlN/NbN Josephson junctions
Superconducting qubits consisting of epitaxially grown NbN/AlN/NbN Josephson junctions
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DOI：
10.1063/1.3663539
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发表时间：
2011-11-21
影响因子：
4
通讯作者：
Wang, Z.
中科院分区：
文献类型：
--
作者：
Nakamura, Y.;Terai, H.;Wang, Z.
我们利用外延生长的约瑟夫森结展示了超导量子比特。在氧化镁（100）衬底上的全外延NbN/AlN/NbN三层结构通过光刻和干法蚀刻加工成具有大约瑟夫森能的transmon量子比特。由立方相AlN而非普通六方相制成的隧道势垒是避免与声子库发生压电耦合的关键。在与单片制造的共面波导谐振器耦合的量子比特中，观察到约500纳秒的能量弛豫时间和自旋回波衰减时间。（C）2011美国物理学会。[doi:10.1063/1.3663539]
We demonstrate superconducting qubits using epitaxially grown Josephson junctions. A fully epitaxial NbN/AlN/NbN trilayer on MgO (100) substrate is processed by photolithography and dry-etching into transmon qubits with a large Josephson energy. The tunnel barrier made of cubic-phase AlN, rather than the ordinary hexagonal phase, is the key to avoid piezoelectric coupling to the phonon bath. The energy-relaxation time and the spin-echo decay time of similar to 500 ns are observed in the qubits that are coupled to a monolithically made coplanar waveguide resonator. (C) 2011 American Institute of Physics. [doi:10.1063/1.3663539]