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 which have tunneled across the junction. In contrast with the charge state of an atomic or molecular ion, the charge states of such an "island" involve a macroscopic number of conduction electrons of the island. The quantum superposition of charge states can be achieved by tuning the gate voltage U that controls the chemical potential of the island. The charge qubit is typically read-out by electrostatically coupling the island to an extremely sensitive electrometer such as the radio-frequency single-electron transistor. Typical T2 coherence times for a charge qubit are on the order of 1–2 μs. Recent work has shown T2 times approaching 100 μs using a type of charge qubit known as a transmon inside a three-dimensional superconducting cavity. Understanding the limits of T2 is an active area of research in the field of superconducting quantum computing. (Wikipedia).
How To Solve an Absolute Value Equation and Test Our Solutions when They Do Not Work
Learn how to solve absolute value equations with extraneous solutions. Absolute value of a number is the positive value of the number. For instance, the absolute value of 2 is 2 and the absolute value of -2 is also 2. To solve an absolute value problem, we first isolate the absolute value
From playlist Solve Absolute Value Equations
Solving a multi step absolute value equation
Learn how to solve absolute value equations with extraneous solutions. Absolute value of a number is the positive value of the number. For instance, the absolute value of 2 is 2 and the absolute value of -2 is also 2. To solve an absolute value problem, we first isolate the absolute value
From playlist Solve Absolute Value Equations
Learn How To Solve an Absolute Value Equation and Check Your Answers
Learn how to solve absolute value equations with extraneous solutions. Absolute value of a number is the positive value of the number. For instance, the absolute value of 2 is 2 and the absolute value of -2 is also 2. To solve an absolute value problem, we first isolate the absolute value
From playlist Solve Absolute Value Equations
Solving Absolute value equations with a variable on both sides
Learn how to solve absolute value equations with extraneous solutions. Absolute value of a number is the positive value of the number. For instance, the absolute value of 2 is 2 and the absolute value of -2 is also 2. To solve an absolute value problem, we first isolate the absolute value
From playlist Solve Absolute Value Equations
How To Calculate Quartiles, Deciles, and Percentiles In Excel
This video tutorial explains how to calculate quartiles, deciles, and percentiles in excel.
From playlist Excel Tutorial
What is a difference quotient? How to find a difference quotient. Deriving it from the rise over run formula.
From playlist 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
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
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
A high-fidelity, quantum-control-tuned gate set for (...) - H. Bluhm - PRACQSYS 2018 - CEB T2 2018
Hendrik Bluhm (JARA-Institute for Quantum Information, RWTH Aachen University, Aachen, Germany) / 02.07.2018 A high-fidelity, quantum-control-tuned gate set for single-triplet spin qubits Singlet-triplet qubits use the collective spin state of two electrons to encode a single qubit, whic
From playlist 2018 - T2 - Measurement and Control of Quantum Systems: Theory and Experiments
Quantum Transport, Lecture 12: Spin Qubits
Instructor: Sergey Frolov, University of Pittsburgh, Spring 2013 http://sergeyfrolov.wordpress.com/ Summary: single spin qubits and singlet-triplet qubits in group III-V semiconductor quantum dots, and silicon-based structures. Quantum Transport course development supported in part by the
From playlist Quantum Transport
Spin Qubits Theory (Lecture – 02) by Guido Burkard
Open Quantum Systems DATE: 17 July 2017 to 04 August 2017 VENUE: Ramanujan Lecture Hall, ICTS Bangalore There have been major recent breakthroughs, both experimental and theoretical, in the field of Open Quantum Systems. The aim of this program is to bring together leaders in the Open Q
From playlist Open Quantum Systems
From bits to qubits: a quantum leap for computers by Susan Coppersmith
DISTINGUISHED LECTURES FROM BITS TO QUBITS: A QUANTUM LEAP FOR COMPUTERS SPEAKER: Susan Coppersmith (University of Wisconsin-Madison, Wisconsin) DATE: 26 September 2018, 16:00 to 17:00 VENUE: Ramanujan Lecture Hall, ICTS Bangalore The steady increase in computational power of informa
From playlist DISTINGUISHED LECTURES
Quantum Transport, Lecture 11: Quantum Bits
Instructor: Sergey Frolov, University of Pittsburgh, Spring 2013 http://sergeyfrolov.wordpress.com/ Summary: DiVincenzo criteria for hardware design of quantum bits, Rabi, Ramsey, spin echo experiments, candidate quantum bit systems. Quantum Transport course development supported in part b
From playlist Quantum Transport
Solving an Absolute Value Equation with Two Solutions
Lean how to solve absolute value equations. Absolute value of a number is the positive value of the number. For instance, the absolute value of 2 is 2 and the absolute value of -2 is also 2. To solve an absolute value equations we need to create the two cases: the positive case and the neg
From playlist Solve Absolute Value Equations
Half angle of Cosine given an angle in radians
👉 Learn how to evaluate the Sine of an angle using the half-angle formula. The half-angle formula for Sine is helpful when you need to determine the exact value of function given an angle but cannot use a calculator or the angle is not on the unit circle. To evaluate all we need to do is
From playlist Half Angle Formulas
Learn how to evaluate left and right hand limits of a function
👉 Learn how to evaluate the limit of an absolute value function. The limit of a function as the input variable of the function tends to a number/value is the number/value which the function approaches at that time. The absolute value function is a function which only takes the positive val
From playlist Evaluate Limits of Absolute Value
Quantum Transport, Lecture 19: Quantum Outlook
Instructor: Sergey Frolov, University of Pittsburgh, Spring 2013 http://sergeyfrolov.wordpress.com/ Summary: surface code, d-wave quantum computer, topological quantum computation. Quantum Transport course development supported in part by the National Science Foundation under grant DMR CAR
From playlist Quantum Transport
Open Quantum Systems DATE: 17 July 2017 to 04 August 2017 VENUE: Ramanujan Lecture Hall, ICTS Bangalore There have been major recent breakthroughs, both experimental and theoretical, in the field of Open Quantum Systems. The aim of this program is to bring together leaders in the Open Q
From playlist Open Quantum Systems
How to evaluate the half angle for cosine in radians
👉 Learn how to evaluate the Sine of an angle using the half-angle formula. The half-angle formula for Sine is helpful when you need to determine the exact value of function given an angle but cannot use a calculator or the angle is not on the unit circle. To evaluate all we need to do is
From playlist Half Angle Formulas