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13/14 PSI - Explorations in Cosmology - Lecture 6

Matthew Johnson York University

April 14, 2014

PIRSA:14040048
13/14 PSI - Explorations in Particle Theory - Lecture 6

Brian Shuve Harvey Mudd College

April 14, 2014

PIRSA:14030053
The computational power of quantum walk

Andrew Childs University of Waterloo

April 11, 2014

PIRSA:14040135
13/14 PSI - Explorations in Cosmology - Lecture 5

Matthew Johnson York University

April 11, 2014

PIRSA:14040045
13/14 PSI - Explorations in Particle Theory - Lecture 5

Brian Shuve Harvey Mudd College

April 11, 2014

PIRSA:14030048
Quantum cosmology in Lorentz-violating gravity
April 10, 2014

PIRSA:14040079
General Relativity & Quantum Cosmology
13/14 PSI - Explorations in Cosmology - Lecture 4

Matthew Johnson York University

April 10, 2014

PIRSA:14040044
13/14 PSI - Explorations in Particle Theory - Lecture 4

Brian Shuve Harvey Mudd College

April 10, 2014

PIRSA:14030047
A non-commuting stabilizer formalism

Xiaotong Ni Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
April 09, 2014

PIRSA:14040136
Quantum Physics

General Relativity & Quantum Cosmology
Almost quantum correlations

Antonio Acin Institute of Photonic Sciences (ICFO)

April 09, 2014

PIRSA:14040065
13/14 PSI - Explorations in Cosmology - Lecture 3

Matthew Johnson York University

April 09, 2014

PIRSA:14040043
13/14 PSI - Explorations in Particle Theory - Lecture 3

Brian Shuve Harvey Mudd College

April 09, 2014

PIRSA:14030046

13/14 PSI - Explorations in Cosmology - Lecture 6

Matthew Johnson York University

April 14, 2014

PIRSA:14040048
13/14 PSI - Explorations in Particle Theory - Lecture 6

Brian Shuve Harvey Mudd College

April 14, 2014

PIRSA:14030053
The computational power of quantum walk

Andrew Childs University of Waterloo

April 11, 2014

PIRSA:14040135

Quantum computers have the potential to solve certain problems dramatically faster than classical computers. One of the main quantum algorithmic tools is the notion of quantum walk, a quantum mechanical analog of random walk. I will describe quantum algorithms based on this idea, including an optimal algorithm for evaluating Boolean formulas and one of the best known algorithms for simulating quantum dynamics. I will also show how quantum walk can be viewed as a universal model of quantum computation.
13/14 PSI - Explorations in Cosmology - Lecture 5

Matthew Johnson York University

April 11, 2014

PIRSA:14040045
13/14 PSI - Explorations in Particle Theory - Lecture 5

Brian Shuve Harvey Mudd College

April 11, 2014

PIRSA:14030048
Quantum cosmology in Lorentz-violating gravity
April 10, 2014

PIRSA:14040079
General Relativity & Quantum Cosmology
Lorentz invariance is considered a fundamental symmetry of physical theories. However, while Lorentz violations are strongly constrained in the matter sector, constraints in the gravitational sector are weaker, allowing to contemplate the idea of Lorentz-violating gravity theories. In this talk I will discuss the effects of Lorentz violations in the quantum cosmology scenario by analyzing the properties of a simple anisotropic model in the framework of Horava-Lifshitz gravity and, if time permitting, some partial results on the viability of this class of theories.
13/14 PSI - Explorations in Cosmology - Lecture 4

Matthew Johnson York University

April 10, 2014

PIRSA:14040044
13/14 PSI - Explorations in Particle Theory - Lecture 4

Brian Shuve Harvey Mudd College

April 10, 2014

PIRSA:14030047
A non-commuting stabilizer formalism

Xiaotong Ni Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
April 09, 2014

PIRSA:14040136
Quantum Physics

General Relativity & Quantum Cosmology
We propose a non-commutative extension of the Pauli stabilizer formalism. The aim is to describe a class of many-body quantum states which is richer than the standard Pauli stabilizer states. In our framework, stabilizer operators are tensor products of single-qubit operators drawn from the group {\alpha I, X,S}, where \alpha=e^{i\pi/4} and S=diag(1,i). We provide techniques to efficiently compute various properties, related to e.g. bipartite entanglement, expectation values of local observables, preparation by means of quantum circuits, parent Hamiltonians etc. We also highlight significant differences compared to the Pauli stabilizer formalism. In particular we give examples of states in our formalism which cannot arise in the Pauli stabilizer formalism, such as topological models that supports non-abelian anyons. This is a joint work with O. Buerschaper and M. van den Nest.
Almost quantum correlations

Antonio Acin Institute of Photonic Sciences (ICFO)

April 09, 2014

PIRSA:14040065

Quantum theory is successfully tested in any experimental lab every day. Apart from its experimental validity, quantum theory also constitutes a robust theoretical framework: small variations of its formalism often lead to highly implausible consequences, such as violation of the no-signalling principle or a significant increase of the computational power. In fact, it has been argued that quantum theory may represent an island in theory space. We show that, at the level of correlations, quantum theory may not be as special as initially thought. In order to do so, we define the set of almost quantum correlations and prove that this set is (i) strictly larger than the set of quantum correlations but (ii) satisfies most of the information principles introduced to characterize quantum correlations, such as local orthogonality, macroscopic locality, no advantage for nonlocal computation or non-trivial communication complexity. We also provide numerical evidence that the set is compatible with information causality. Finally, we briefly discuss how the set of almost quantum correlations naturally emerges in the consistent histories approach to quantum physics.
13/14 PSI - Explorations in Cosmology - Lecture 3

Matthew Johnson York University

April 09, 2014

PIRSA:14040043
13/14 PSI - Explorations in Particle Theory - Lecture 3

Brian Shuve Harvey Mudd College

April 09, 2014

PIRSA:14030046

Title	Date	Collection	Type	Info
13/14 PSI - Explorations in Cosmology - Lecture 6	2014‑04‑14	13/14 PSI - Explorations in Cosmology	Course	View details
13/14 PSI - Explorations in Particle Theory - Lecture 6	2014‑04‑14	13/14 PSI - Explorations in Particle Theory	Course	View details
The computational power of quantum walk	2014‑04‑11	Colloquium	Scientific Series	View details
13/14 PSI - Explorations in Cosmology - Lecture 5	2014‑04‑11	13/14 PSI - Explorations in Cosmology	Course	View details
13/14 PSI - Explorations in Particle Theory - Lecture 5	2014‑04‑11	13/14 PSI - Explorations in Particle Theory	Course	View details
Quantum cosmology in Lorentz-violating gravity	2014‑04‑10	Quantum Gravity	Scientific Series	View details
13/14 PSI - Explorations in Cosmology - Lecture 4	2014‑04‑10	13/14 PSI - Explorations in Cosmology	Course	View details
13/14 PSI - Explorations in Particle Theory - Lecture 4	2014‑04‑10	13/14 PSI - Explorations in Particle Theory	Course	View details
A non-commuting stabilizer formalism	2014‑04‑09	Perimeter Institute Quantum Discussions	Scientific Series	View details
Almost quantum correlations	2014‑04‑09	Colloquium	Scientific Series	View details
13/14 PSI - Explorations in Cosmology - Lecture 3	2014‑04‑09	13/14 PSI - Explorations in Cosmology	Course	View details
13/14 PSI - Explorations in Particle Theory - Lecture 3	2014‑04‑09	13/14 PSI - Explorations in Particle Theory	Course	View details

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13/14 PSI - Explorations in Cosmology - Lecture 6

13/14 PSI - Explorations in Particle Theory - Lecture 6

The computational power of quantum walk

13/14 PSI - Explorations in Cosmology - Lecture 5

13/14 PSI - Explorations in Particle Theory - Lecture 5

Quantum cosmology in Lorentz-violating gravity

13/14 PSI - Explorations in Cosmology - Lecture 4

13/14 PSI - Explorations in Particle Theory - Lecture 4

A non-commuting stabilizer formalism

Almost quantum correlations

13/14 PSI - Explorations in Cosmology - Lecture 3

13/14 PSI - Explorations in Particle Theory - Lecture 3

13/14 PSI - Explorations in Cosmology - Lecture 6

13/14 PSI - Explorations in Particle Theory - Lecture 6

The computational power of quantum walk

13/14 PSI - Explorations in Cosmology - Lecture 5

13/14 PSI - Explorations in Particle Theory - Lecture 5

Quantum cosmology in Lorentz-violating gravity

13/14 PSI - Explorations in Cosmology - Lecture 4

13/14 PSI - Explorations in Particle Theory - Lecture 4

A non-commuting stabilizer formalism

Almost quantum correlations

13/14 PSI - Explorations in Cosmology - Lecture 3

13/14 PSI - Explorations in Particle Theory - Lecture 3