Voltage-Tunable Superconducting Resonators: A Platform for Random Access Quantum Memory

Sardashti, Kasra; Dartiailh, Matthieu; Yuan, Joseph; Hart, Sean; Gumann, Patryk; Shabani, Javad

doi:10.1109/tqe.2020.3034553

Cited by 24 publications

(15 citation statements)

References 30 publications

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“…约瑟夫森临界电流可通过室温下的电阻算出, 易于进行快速器件检测 [109] , 也可激光退火改变结区的电阻, 按需改变临界电流 [110] . 无论是使用单个结的频率固定的Transmon比特, 还是使用 [95] , 可用于制备频率可控的比特或谐振器 [111] , 或用于制作电荷量子干涉器件 [112] . 如果结区为金属, 由于电流密度较大, 有可能出现新的物理现象 [2] .…”

Section: 铝是超导电路中常用的材料在蓝宝石衬底上外延铝膜不同的衬底处理方式对薄膜表面平整度以及unclassified

Materials in superconducting quantum circuits

et al. 2021

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Section: 铝是超导电路中常用的材料在蓝宝石衬底上外延铝膜不同的衬底处理方式对薄膜表面平整度以及unclassified

Materials in superconducting quantum circuits

et al. 2021

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“…This newer shape is typically favored as it provides better interconnectivity between different parts of a design. Although the physical implementation of the transmon qubit is different from more traditional CPB qubits, a Hamiltonian with the same form as (13) can still be used to describe its behavior [17]. Similarly, a SQUID can be used to connect the different superconductors that make up the transmon (see Fig.…”

Section: Transmonmentioning

confidence: 99%

“…This allows the typically fragile quantum states involved to survive for long enough times that planar "on-chip" realizations of the fundamental interactions of light and matter necessary to create and process quantum information can be leveraged at microwave frequencies [3]- [5]. Using these tools and the flexibility of these architectures, circuit QED designs have been implemented for a wide range of quantum technologies including analog quantum computers [6], digital or gate-based quantum computers [1], [7], [8], single photon sources [9]- [11], quantum memories [12], [13], and components of quantum communication systems [14].…”

Section: Introductionmentioning

confidence: 99%

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An Introduction to the Transmon Qubit for Electromagnetic Engineers

Roth¹,

Ma²,

Chew³

2021

Preprint

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One of the most popular approaches being pursued to achieve a quantum advantage with practical hardware are superconducting circuit devices. Although significant progress has been made over the previous two decades, substantial engineering efforts are required to scale these devices so they can be used to solve many problems of interest. Unfortunately, much of this exciting field is described using technical jargon and concepts from physics that are unfamiliar to a classically trained electromagnetic engineer. As a result, this work is often difficult for engineers to become engaged in. We hope to lower the barrier to this field by providing an accessible review of one of the most prevalently used quantum bits (qubits) in superconducting circuit systems, the transmon qubit. Most of the physics of these systems can be understood intuitively with only some background in quantum mechanics. As a result, we avoid invoking quantum mechanical concepts except where it is necessary to ease the transition between details in this work and those that would be encountered in the literature. We believe this leads to a gentler introduction to this fascinating field, and hope that more researchers from the classical electromagnetic community become engaged in this area in the future.

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“…As a result, these systems utilize many circuit components and techniques that are very familiar to classical microwave engineers; including coplanar waveguide transmission lines and resonators, circulators, wire bonds or airbridges, and distributed inductors and capacitors, to name a few [3]- [5]. Using these tools, circuit QED designs for a wide range of quantum technologies have been demonstrated, including analog quantum computers [6], digital or gate-based quantum computers [7]- [10], single photon sources [11]- [13], quantum memories [14], [15], and components of quantum communication systems [16].…”

Section: Introductionmentioning

confidence: 99%

Full-Wave Methodology to Compute the Spontaneous Emission Rate of a Transmon Qubit

Roth¹,

Chew²

2022

Preprint

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The spontaneous emission rate (SER) is an important figure of merit for any quantum bit (qubit), as it can play a significant role in the control and decoherence of the qubit. As a result, accurately characterizing the SER for practical devices is an important step in the design of quantum information processing devices. Here, we specifically focus on the experimentally popular platform of a transmon qubit, which is a kind of superconducting circuit qubit. Despite the importance of understanding the SER of these qubits, it is often determined using approximate circuit models or is inferred from measurements on a fabricated device. To improve the accuracy of predictions in the design process, it is better to use full-wave numerical methods that can make a minimal number of approximations in the description of practical systems. In this work, we show how this can be done with a recently developed field-based description of transmon qubits coupled to an electromagnetic environment. We validate our model by computing the SER for devices similar to those found in the literature that have been well-characterized experimentally. We further cross-validate our results by comparing them to simplified lumped element circuit and transmission line models as appropriate.

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Voltage-Tunable Superconducting Resonators: A Platform for Random Access Quantum Memory

Cited by 24 publications

References 30 publications

Materials in superconducting quantum circuits

Materials in superconducting quantum circuits

An Introduction to the Transmon Qubit for Electromagnetic Engineers

Full-Wave Methodology to Compute the Spontaneous Emission Rate of a Transmon Qubit

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