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PugsGHub / Quantum_Comp.md
Last active January 1, 2022 21:33
Resources for Quantum Computing and Information Theory
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PugsGHub / Stat_Mech.md
Created December 21, 2021 02:46
Stat Mech Reading Group
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PugsGHub / FT_Schedule.md
Last active April 15, 2021 14:55
FT_Schedule

Detailled Schedule

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PugsGHub / FT_Questions.md
Last active April 7, 2021 02:38
All the questions that arose during our discussions of field theory

Questions from Week 1

  1. What is the necessity for fields?
  2. How do we go about constructing conservation laws for discrete transformations?
  3. Are transformations of the field itself physically meaningful?
  4. Apart from lie groups, are there any set of other groups that prove more useful in QFT?
  5. Why do only think of one parameter Lie groups in the context of Noether's theorem?

Questions from Week 2

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PugsGHub / Hannover_Rules.md
Last active August 11, 2021 14:37
A summary of Tobias Osborne's first lecture on "Theory of Quantum Noise and Decoherence"
  • Observables are Hermitian elements of the observable algebra $\mathcal{A}$
  • A $\mathcal{C}$-algebra is a set that is closed under addition, multiplication and multiplication by scalars $k \in \mathbb{C}$
  • Each element $A \in \mathcal{A}$ has an adjoint $A^{\dagger}$
  • An element $E \in \mathcal{A}$ is positive if $\exists \ A \in \mathcal{A}$ such that $E = A^{\dagger} A$
  • For us $\mathcal{A}$ will always be the set of all bounded operators on a Hilbert space $\mathcal{B}(\mathcal{H})$
  • Measurements themselves are described by assigning to each outcome of the device an effect $E \in \mathcal{A}$, which satisfies $0 \leq E \leq \mathbb{I}$
  • A state $\omega$ on $\mathcal{A}$ is a positive normalized linear functional on $\mathcal{A}$, that follows the rules:
    • $\omega : \mathcal{A} \rightarrow \mathbb{C}$, is a linear map
    • $\omega(X^{\dagger}X) \geq 0$
  • $\omega(\mathbb{I}) = 1$