兒子的博士論文
https://arxiv.org/abs/1803.04711
Scalable 3D quantum memory
Edwar Xie, Frank Deppe, Daniel Repp, Peter Eder, Michael Fischer, Jan Goetz, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, Rudolf Gross
(Submitted on 13 Mar 2018)
Superconducting
3D microwave cavities offer state-of-the-art coherence times and a well
controlled environment for superconducting qubits. In order to realize
at the same time fast readout and long-lived quantum information
storage, one can couple the qubit both to a low-quality readout and a
high-quality storage cavity. However, such systems are bulky compared to
their less coherent 2D counterparts. A more compact and scalable
approach is achieved by making use of the multimode structure of a 3D
cavity. In our work, we investigate such a device where a transmon qubit
is capacitively coupled to two modes of a single 3D cavity. The
external coupling is engineered so that the memory mode has an about 100
times larger quality factor than the readout mode. Using an
all-microwave second-order protocol, we realize a lifetime enhancement
of the stored state over the qubit lifetime by a factor of6with aZ-fidelity of82%. We also find that this enhancement is not limited by fundamental constraints.
Submission history
From: Edwar Xie [view email]
[v1] Tue, 13 Mar 2018 10:12:24 GMT (942kb,D)
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