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. Only an integer number of flux quanta are allowed to penetrate the superconducting ring, resulting in clockwise or counter-clockwise mesoscopic supercurrents (typically 300 nA) in the loop to compensate (screen or enhance) a non-integer external flux bias. When the applied flux through the loop area is close to a half integer number of flux quanta, the two lowest energy eigenstates of the loop will be a quantum superposition of the clockwise and counter-clockwise currents.The two lowest energy eigenstates differ only by the relative quantum phase between the composing current-direction states. Higher energy eigenstates correspond to much larger (macroscopic) persistent currents, that induce an additional flux quantum to the qubit loop, thus are well separated energetically from the lowest two eigenstates. This separation, known as the "qubit non linearity" criteria, allows operations with the two lowest eigenstates only, effectively creating a two level system. Usually, the two lowest eigenstates will serve as the computational basis for the logical qubit. Computational operations are performed by pulsing the qubit with microwave frequency radiation which has an energy comparable to that of the gap between the energy of the two basis states, similar to RF-SQUID. Properly selected pulse duration and strength can put the qubit into a quantum superposition of the two basis states while subsequent pulses can manipulate the probability weighting that the qubit will be measured in either of the two basis states, thus performing a computational operation. (Wikipedia).
Flux Integrals | Lecture 42 | Vector Calculus for Engineers
A flux integral is the surface integral of a vector field. For examples, the mass flux is computed in fluid mechanics and the electric and magnetic fluxes are computed in electromagnetism. Both types of flux integrals are discussed in this video.
From playlist Vector Calculus for Engineers
Flux + Gauss divergence theorem
Free ebook http://tinyurl.com/EngMathYT How to calculate flux in the plane by Gauss' divergence theorem. An example is presented illustrating the ideas.
From playlist Several Variable Calculus / Vector Calculus
Physics - Advanced E&M: Ch 1 Math Concepts (11 of 55) What is the Divergent of a Vector?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain, develop the equation, and give examples of the divergence of a vector. Next video in this series can be seen at: https://youtu.be/f1LYLx0C2QI
From playlist PHYSICS 67 ADVANCED ELECTRICITY & MAGNETISM
PHYS 102 | Vector Flux 1 - The Concept of Vector Flux
The most difficult part about Gauss's Law is a clear understanding of vector flux. Be sure this description sinks in before moving on! -----Gauss's Law playlist - https://www.youtube.com/playlist?list=PL9_sR6Qqqcymo0o3rA-Ui7Xh36wF6fryh -----Use the channel, or take the courses at edX - h
From playlist PHYS 102 | Gauss's Law
Magnetic Flux, Basic Introduction - Physics Problems
This physics video tutorial provides a basic introduction into magnetic flux. The magnetic flux is the product of the area of a surface and the component of the magnetic field that is perpendicular to the surface. This video explains how to calculate the magnetic flux passes through a sq
From playlist New Physics Video Playlist
Calculus 3: Vector Calculus in 2D (17 of 39) What is the Position Vector?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain what is the position vector. The position vector indicates the position of a particle relative to the origin. The position usually depends on, or is a function of, a parametric variable (ex. t
From playlist CALCULUS 3 CH 3 VECTOR CALCULUS
Quantum Transport, Lecture 16: Superconducting qubits
Instructor: Sergey Frolov, University of Pittsburgh, Spring 2013 http://sergeyfrolov.wordpress.com/ Summary: quantum electrical circuits - flux qubits, phase qubits and charge qubits. Quantum Transport course development supported in part by the National Science Foundation under grant DMR
From playlist Quantum Transport
Hybrid quantum/classical computing on a 19-qubit (...) - N. Didier - PRACQSYS 2018 - CEB T2 2018
Nicolas Didier (Rigetti Computing, Berkeley, USA) / 04.07.2018 Hybrid quantum/classical computing on a 19-qubit processor based on parametrically-activated entangling gates Superconducting devices are one of the most promising platforms for building quantum computers, but demonstrating f
From playlist 2018 - T2 - Measurement and Control of Quantum Systems: Theory and Experiments
Superconducting Hybrid Device with a Transmon Qubit by Vibhor Singh
PROGRAM NON-HERMITIAN PHYSICS (ONLINE) ORGANIZERS: Manas Kulkarni (ICTS, India) and Bhabani Prasad Mandal (Banaras Hindu University, India) DATE: 22 March 2021 to 26 March 2021 VENUE: Online Non-Hermitian Systems / Open Quantum Systems are not only of fundamental interest in physics a
From playlist Non-Hermitian Physics (ONLINE)
Quantum Transport, Lecture 18: Coupled Qubits
Instructor: Sergey Frolov, University of Pittsburgh, Spring 2013 http://sergeyfrolov.wordpress.com/ Summary: experiments on two and more coupled flux qubits, transmons, and spin qubits. Quantum Transport course development supported in part by the National Science Foundation under grant DM
From playlist Quantum Transport
Determine the Flux of a 2D Vector Field Using Green's Theorem (Rectangle)
This video explains how to determine the flux of a 2D vector field using the flux form of Green's Theorem. http://mathispower4u.com
From playlist Line Integrals
Quantum Transport, Lecture 17: Quantum Hybrids
Instructor: Sergey Frolov, University of Pittsburgh, Spring 2013 http://sergeyfrolov.wordpress.com/ Summary: transmon qubits, microwave resonators, circuit QED. Quantum Transport course development supported in part by the National Science Foundation under grant DMR CAREER 1252962.
From playlist Quantum Transport
AQC 2016 - Building Quantum Annealer v2.0
A Google TechTalk, June 28, 2016, presented by Yu Chen (Google) ABSTRACT: Quantum annealer, constructed from an array of coupled flux qubits, represents an analog approach to build a quantum computer. In Quantum A.I. Lab, we are working on building an enhanced-performance quantum anneale
From playlist Adiabatic Quantum Computing Conference 2016
Quantum measurement of coherent states and qubits by Michael Hatridge
Non-Hermitian Physics - PHHQP XVIII DATE: 04 June 2018 to 13 June 2018 VENUE:Ramanujan Lecture Hall, ICTS Bangalore Non-Hermitian Physics-"Pseudo-Hermitian Hamiltonians in Quantum Physics (PHHQP) XVIII" is the 18th meeting in the series that is being held over the years in Quantum Phys
From playlist Non-Hermitian Physics - PHHQP XVIII
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PROGRAM CLASSICAL AND QUANTUM TRANSPORT PROCESSES : CURRENT STATE AND FUTURE DIRECTIONS (ONLINE) ORGANIZERS: Alberto Imparato (University of Aarhus, Denmark), Anupam Kundu (ICTS-TIFR, India), Carlos Mejia-Monasterio (Technical University of Madrid, Spain) and Lamberto Rondoni (Polytechn
From playlist Classical and Quantum Transport Processes : Current State and Future Directions (ONLINE)2022
AQC 2016 - Controlled Interactions Between Superconducting Qubits for Adiabatic Quantum Simulations
A Google TechTalk, June 28, 2016, presented by Stefan Filipp (IBM Research) ABSTRACT: The controlled realization of different types of interactions between qubits without compromising their coherence is essential for adiabatic and analog quantum simulations. In the context of superconduct
From playlist Adiabatic Quantum Computing Conference 2016
The electric field in a uniform charge density throughout an infinite space. My Patreon page is at https://www.patreon.com/EugeneK
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Winter Theory School 2022: Pedram Roushan
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From playlist Winter Theory 2022