scholarly journals Modeling Enclosures for Large-Scale Superconducting Quantum Circuits

2020 ◽  
Vol 14 (2) ◽  
Author(s):  
P.A. Spring ◽  
T. Tsunoda ◽  
B. Vlastakis ◽  
P.J. Leek
Keyword(s):  
Large Scale ◽  
Quantum Circuits ◽  
Superconducting Quantum Circuits

scholarly journals Towards practical quantum computers: transmon qubit with a lifetime approaching 0.5 milliseconds

2022 ◽  
Vol 8 (1) ◽  
Author(s):  
Chenlu Wang ◽  
Xuegang Li ◽  
Huikai Xu ◽  
Zhiyuan Li ◽  
Junhua Wang ◽  
...  
Keyword(s):  
Large Scale ◽  
Dry Etching ◽  
Wet Etching ◽  
Etching Process ◽  
Quantum Circuits ◽  
Quantum Computers ◽  
Tantalum Films ◽  
Long Lifetime ◽  
Superconducting Quantum Circuits

AbstractHere we report a breakthrough in the fabrication of a long lifetime transmon qubit. We use tantalum films as the base superconductor. By using a dry etching process, we obtained transmon qubits with a best T1 lifetime of 503 μs. As a comparison, we also fabricated transmon qubits with other popular materials, including niobium and aluminum, under the same design and fabrication processes. After characterizing their coherence properties, we found that qubits prepared with tantalum films have the best performance. Since the dry etching process is stable and highly anisotropic, it is much more suitable for fabricating complex scalable quantum circuits, when compared to wet etching. As a result, the current breakthrough indicates that the dry etching process of tantalum film is a promising approach to fabricate medium- or large-scale superconducting quantum circuits with a much longer lifetime, meeting the requirements for building practical quantum computers.

scholarly journals Andreev Probe of Persistent Current States in Superconducting Quantum Circuits

2005 ◽  
Vol 95 (14) ◽  
Author(s):  
V. T. Petrashov ◽  
K. G. Chua ◽  
K. M. Marshall ◽  
R. Sh. Shaikhaidarov ◽  
J. T. Nicholls
Keyword(s):  
Persistent Current ◽  
Quantum Circuits ◽  
Superconducting Quantum Circuits

scholarly journals Fully in situ Nb/InAs-nanowire Josephson junctions by selective-area growth and shadow evaporation

2021 ◽  
Author(s):  
Pujitha Perla ◽  
H. Aruni Fonseka ◽  
Patrick Zellekens ◽  
Russell Deacon ◽  
Yisong Han ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Josephson Junctions ◽  
Quantum Circuits ◽  
Selective Area Growth ◽  
Selective Area ◽  
Area Growth ◽  
Shadow Evaporation ◽  
Superconducting Quantum Circuits

Nb/InAs-nanowire Josephson junctions are fabricated in situ by a special shadow evaporation scheme for the superconducting Nb electrode. The junctions are interesting candidates for superconducting quantum circuits requiring large magnetic fields.

scholarly journals Free-mode removal and mode decoupling for simulating general superconducting quantum circuits

2021 ◽  
Vol 103 (17) ◽  
Author(s):  
Dawei Ding ◽  
Hsiang-Sheng Ku ◽  
Yaoyun Shi ◽  
Hui-Hai Zhao
Keyword(s):  
Quantum Circuits ◽  
Free Mode ◽  
Superconducting Quantum Circuits

Effective gauge potentials induced by superconducting quantum circuits

2011 ◽  
Vol 375 (4) ◽  
pp. 808-811 ◽  
Author(s):  
Zhi-Bo Feng ◽  
An-Mei Wang ◽  
Run-Ying Yan
Keyword(s):  
Quantum Circuits ◽  
Superconducting Quantum Circuits

Large scale multi-node simulations of ℤ2 gauge theory quantum circuits using Google Cloud Platform

2021 ◽  
Author(s):  
Erik Gustafson ◽  
Burt Holzman ◽  
James Kowalkowski ◽  
Henry Lamm ◽  
Andy C. Y. Li ◽  
...  
Keyword(s):  
Gauge Theory ◽  
Large Scale ◽  
Quantum Circuits ◽  
Cloud Platform

scholarly journals Advanced exact synthesis of Clifford+T circuits

2020 ◽  
Vol 19 (9) ◽  
Author(s):  
Philipp Niemann ◽  
Robert Wille ◽  
Rolf Drechsler
Keyword(s):  
Large Scale ◽  
Fault Tolerant ◽  
Logic Synthesis ◽  
Research Problem ◽  
Quantum Systems ◽  
Quantum Circuits ◽  
Research Attention ◽  
Small Quantum ◽  
Significant Research ◽  
Important Research Problem

Abstract Quantum systems provide a new way of conducting computations based on the so-called qubits. Due to the potential for significant speed-ups, this field received significant research attention in recent years. The Clifford+T library is a very promising and popular gate library for these kinds of computations. Unlike other libraries considered so far, it consists of only a small number of gates for all of which robust, fault-tolerant realizations are known for many technologies that seem to be promising for large-scale quantum computing. As a consequence, (logic) synthesis of Clifford+T quantum circuits became an important research problem. However, previous work in this area has several drawbacks: Corresponding approaches are either only applicable to very small quantum systems or lead to circuits that are far from being optimal. The latter is mainly caused by the fact that current synthesis realizes the desired circuit by a local, i.e., column-wise, consideration of the underlying unitary transformation matrix to be synthesized. In this paper, we analyze the conceptual drawbacks of this approach and propose to overcome them by taking a global view of the matrices and perform a separation of concerns regarding individual synthesis steps. We precisely describe a corresponding algorithm as well as its efficient implementation on top of decision diagrams. Experimental results confirm the resulting benefits and show improvements of up to several orders of magnitudes in costs compared to previous work.

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