Séance de cours

Inductance de Josephson et Qubits Transmon

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Dans cours

QUANT-400: Introduction to quantum science and technology

A broad view of the diverse aspects of the field is provided: quantum physics, communication, quantum computation, simulation of physical systems, physics of qubit platforms, hardware technologies. Students will grasp the field as a whole and better orient ...

Description

Cette séance de cours couvre le concept d'inductance Josephson, un inducteur non linéaire dont la valeur dépend de la phase et du courant. Il explique la jonction de Josephson, son énergie et les techniques de fabrication d'une jonction de tunnel de Josephson. La séance de cours traite également de la boîte à paires Cooper, de ses niveaux d'énergie et du qubit Transmon comme un qubit insensible au bruit de charge. Il s'enfonce dans la dispersion et l'anharmonisité du qubit transmon, en l'accordant avec le flux magnétique, ainsi que sa conception et sa fabrication. En outre, il explore le Transmon comme un oscillateur anharmonique et son comportement sous conduite rapide. La séance de cours se termine par des exemples pratiques et des applications des concepts discutés.

Enseignant·e·s (7)

Edoardo Charbon

voir version Anglaise

Pasquale Scarlino

I obtained my master's degree in Physics at the University of Salento, Lecce (Italy) in February 2011. During 2006-2011, I have also been a student of Scuola Superiore ISUFI (SSI). SSI is one of six schools of excellence established in Italy to develop the intellectual capital in technological and social sciences. I conducted an external Master thesis project during an 8 months internship in the Quantum Transport Group at TU Delft, under the supervision of Prof. L.M.K. Vandersypen. There, I implemented the Quantum Point Contact Radio-Frequency Reflectometry technique, which allows increasing the single-shot electron spin readout bandwidth and is currently routinely used in the group.I obtained my Ph.D. degree in February 2016, in the Spin Qubits group of Prof. L.M.K. Vandersypen at the Kavli Institute of Nanoscience-Qutech (TU Delft). During my Ph.D. I have been leading the Si/SiGe spin qubits project, collaborating with the M. Eriksson Group at Wisconsin University. In parallel, I have been working on other different projects, in particular with GaAs depletion quantum dots, high impedance superconducting resonators, and surface acoustic wave resonators. I have been working as a Postdoc fellow in the group of Prof. A. Wallraff (Quantum Device Lab) at ETH Zurich. My main project, in collaboration with the group of Prof. K. Ensslin and Prof. T. Ihn, consisted in integrating semiconductor and superconductor technologies. Realizing a well-controlled interface between the semiconductor and superconductor-based quantum information technologies may allow harnessing the best of both device architectures, for example by providing an interface between strongly coupled charge state and high coherence spin states. Furthermore, it enables the possibility to explore light/matter hybridization in a class of solid-state systems and regimes that are new in the context of quantum optics.From June 2019 till September 2020, I have been a Senior Researcher at Microsoft Station Q Copenhagen and at the Center for Quantum Devices in Copenhagen, focusing on developing semiconductor-superconducting hybrid hardware for topologically protected quantum computation.Since October 2020, I am a tenure track Assistant Professor of Physics in the School of Basic Sciences at the EPFL where I founded the Hybrid Quantum Circuit (HQC) laboratory.

Giuseppe Carleo

Twitter https://twitter.com/gppcarleo Enseignement et PhD Doctorant·es actuel·les Gian Gentinetta, Linda Mauron, Samuele Piccinelli, Alessandro Sinibaldi, Shao Hen Chiew, David Linteau, Clemens Giuliani, Ali Goodarzi, Gianluca Grosso, Ruize Ma, Ekaterina Pankovets A dirigé les thèses EPFL de Dian Wu, Julien Sebastian Gacon, Gabriel Maria Pescia, Barison Stefano, Imelda Romero Cours Advanced computational physics PHYS-339 Le cours couvre l'algèbre linéaire dense/creuse, les méthodes variati

Source officielle

Proximité ontologique

Physique

Électromagnétisme: Circuit électrique

Informatique théorique

Theory of computation: Informatique quantique

Concepts associés (31)

Superconducting quantum computing

Superconducting quantum computing is a branch of solid state quantum computing that implements superconducting electronic circuits using superconducting qubits as artificial atoms, or quantum dots. For superconducting qubits, the two logic states are the ground state and the excited state, denoted respectively. Research in superconducting quantum computing is conducted by companies such as Google, IBM, IMEC, BBN Technologies, Rigetti, and Intel. Many recently developed QPUs (quantum processing units, or quantum chips) utilize superconducting architecture.

Supraconductivité

La supraconductivité, ou supraconduction, est un phénomène physique caractérisé par l'absence de résistance électrique et l'expulsion du champ magnétique — l'effet Meissner — à l'intérieur de certains matériaux dits supraconducteurs. La supraconductivité découverte historiquement en premier, et que l'on nomme communément supraconductivité conventionnelle, se manifeste à des températures très basses, proches du zéro absolu (). La supraconductivité permet notamment de transporter de l'électricité sans perte d'énergie.

Flux qubit

In quantum computing, more specifically in superconducting quantum computing, flux qubits (also known as persistent current qubits) are micrometer sized loops of superconducting metal that is interrupted by a number of Josephson junctions. These devices function as quantum bits. The flux qubit was first proposed by Terry P. Orlando et al. at MIT in 1999 and fabricated shortly thereafter. During fabrication, the Josephson junction parameters are engineered so that a persistent current will flow continuously when an external magnetic flux is applied.

Phase qubit

In quantum computing, and more specifically in superconducting quantum computing, the phase qubit is a superconducting device based on the superconductor–insulator–superconductor (SIS) Josephson junction, designed to operate as a quantum bit, or qubit. The phase qubit is closely related, yet distinct from, the flux qubit and the charge qubit, which are also quantum bits implemented by superconducting devices.

Charge qubit

In quantum computing, a charge qubit (also known as Cooper-pair box) is a qubit whose basis states are charge states (i.e. states which represent the presence or absence of excess Cooper pairs in the island). In superconducting quantum computing, a charge qubit is formed by a tiny superconducting island coupled by a Josephson junction (or practically, superconducting tunnel junction) to a superconducting reservoir (see figure). The state of the qubit is determined by the number of Cooper pairs that have tunneled across the junction.

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Séances de cours associées (56)

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Couvre l'électrodynamique quantique à cavité hybride avec des points quantiques et des réseaux de jonction Josephson, en se concentrant sur les qubits de spin et les qubits supraconducteurs.

Qubits supraconducteurs : histoire et théorie du BCS

Explore l'histoire des qubits supraconducteurs et les fondamentaux de la supraconductivité et de la théorie BCS.

Métrologie quantique: Électronique supraconductrice & Qubits

Explore la métrologie quantique, l'électronique supraconductrice, les détecteurs, les qubits et la suprématie quantique, mettant l'accent sur les progrès dans le calcul quantique.

Couplage capacitif: Interaction entre deux qubits

Couvre le couplage capacitif de deux qubits et ses implications en mécanique quantique.

Josephson Junctions: Théorie et applications

Explore les jonctions de Josephson, couvrant la théorie, la fabrication et les applications pratiques dans l'électronique supraconductrice.

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Concepts associés (31)

Superconducting quantum computing