Quantum Physics

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12/13 PSI - Explorations on Quantum Information Lecture 8

David Cory Institute for Quantum Computing (IQC)
March 27, 2013

PIRSA:13030063
Quantum Physics
The Quantum Steering Ellipsoid

Sania Jevtic Imperial College London
March 26, 2013

PIRSA:13030112
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 7

David Cory Institute for Quantum Computing (IQC)
March 26, 2013

PIRSA:13030062
Quantum Physics
Wick's theorem for Matrix Product states

Robert Huebener Freie Universität Berlin
March 25, 2013

PIRSA:13030117
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 6

David Cory Institute for Quantum Computing (IQC)
March 25, 2013

PIRSA:13030061
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 5

David Cory Institute for Quantum Computing (IQC)
March 22, 2013

PIRSA:13030058
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 4

David Cory Institute for Quantum Computing (IQC)
March 21, 2013

PIRSA:13030057
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 3

David Cory Institute for Quantum Computing (IQC)
March 20, 2013

PIRSA:13030056
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 2

David Cory Institute for Quantum Computing (IQC)
March 19, 2013

PIRSA:13030055
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 1

David Cory Institute for Quantum Computing (IQC)
March 18, 2013

PIRSA:13030054
Quantum Physics
Neorealism and the Internal Language of Topoi

Sander Wolters Radboud Universiteit Nijmegen
March 12, 2013

PIRSA:13030107
Quantum Physics
Efficient Distributed Quantum Computing

Oliver Gray University of Bristol
March 11, 2013

PIRSA:13030104
Quantum Physics

12/13 PSI - Explorations on Quantum Information Lecture 8

David Cory Institute for Quantum Computing (IQC)
March 27, 2013

PIRSA:13030063
Quantum Physics
The Quantum Steering Ellipsoid

Sania Jevtic Imperial College London
March 26, 2013

PIRSA:13030112
Quantum Physics
A quantum steering ellipsoid may be used to faithfully represent a density matrix ? describing two qubits A and B. The ellipsoid is the geometric set of states that Bob can steer Alice's qubit to when he implements all possible measurements on his qubit. We show how the correlations between qubits A and B manifest themselves in this paradigm, giving simple conditions for when the state is entangled, or has discord. We will also present novel features of the two qubit state that are revealed by the steering ellipsoid formalism, and show that a state corresponding to an ellipsoid with non-zero volume contains a new type of correlation.
12/13 PSI - Explorations on Quantum Information Lecture 7

David Cory Institute for Quantum Computing (IQC)
March 26, 2013

PIRSA:13030062
Quantum Physics
Wick's theorem for Matrix Product states

Robert Huebener Freie Universität Berlin
March 25, 2013

PIRSA:13030117
Quantum Physics
Matrix product states and their continuous analogues are variational classes of states that capture quantum many-body systems or quantum fields with low entanglement; they are at the basis of the density-matrix renormalization group method and continuous variants thereof. In this talk we show that, generically, N-point functions of arbitrary operators in discrete and continuous translation invariant matrix product states are completely characterized by the corresponding two- and three-point functions. Aside from having important consequences for the structure of correlations in quantum states with low entanglement, this result provides a new way of reconstructing unknown states from correlation measurements e.g. for one-dimensional continuous systems of cold atoms. We argue that such a relation of correlation functions may help in devising perturbative approaches to interacting theories.

Joint work with Andrea Mari and Jens Eisert.
arXiv:1207.6537
12/13 PSI - Explorations on Quantum Information Lecture 6

David Cory Institute for Quantum Computing (IQC)
March 25, 2013

PIRSA:13030061
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 5

David Cory Institute for Quantum Computing (IQC)
March 22, 2013

PIRSA:13030058
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 4

David Cory Institute for Quantum Computing (IQC)
March 21, 2013

PIRSA:13030057
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 3

David Cory Institute for Quantum Computing (IQC)
March 20, 2013

PIRSA:13030056
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 2

David Cory Institute for Quantum Computing (IQC)
March 19, 2013

PIRSA:13030055
Quantum Physics
12/13 PSI - Explorations on Quantum Information Lecture 1

David Cory Institute for Quantum Computing (IQC)
March 18, 2013

PIRSA:13030054
Quantum Physics
Neorealism and the Internal Language of Topoi

Sander Wolters Radboud Universiteit Nijmegen
March 12, 2013

PIRSA:13030107
Quantum Physics
Crudely formulated, the idea of neorealism, in the way that Chris Isham and Andreas Doering use it, means that each theory of physics, in its mathematical formulation should share certain structural properties of classical physics. These properties are chosen to allow some degree of realism in the interpretation (for example, physical variables always have values). Apart from restricting the form of physical theories, neorealism does increase freedom in the shape of physical theories in another way. Theories of physics may be interpreted in other topoi than the category of sets and functions. In my talk I will concentrate on two topos models for quantum theory. The contravariant model of Butterfield, Isham and Doering on the one hand, and the covariant model of Heunen, Landsman and Spitters on the other. I will argue that when we think of the topoi as generalized categories of sets (i.e. when we use the internal perspective of the topoi at hand), these two models are closely related, and both resemble classical physics. I will assume no background knowledge in topos theory.
Efficient Distributed Quantum Computing

Oliver Gray University of Bristol
March 11, 2013

PIRSA:13030104
Quantum Physics
I will explain how to simulate arbitrary quantum circuits on a distributed quantum computer (DQC), in which the pairs of qubits that are allowed to interact are restricted to the edges of some (connected) graph G. Even for graphs with only a modest number of long-range qubit interactions, such as the hypercube, this simulation is, in fact, efficient. Furthermore, for all graphs, the emulation scheme is very close to being optimal. Secondly I will present an efficient quantum algorithm for parallel unrestricted memory look-up. As an application, I will show that the space-time trade off for Element Distinctness and Collision Finding can be improved. Both results arise from applying the ideas of reversible sorting networks to quantum computing.http://arxiv.org/abs/1207.2307

Title	Speaker(s)	Date	Talk Type	Info link
12/13 PSI - Explorations on Quantum Information Lecture 8	David Cory	2013-03-27	Course	View details
The Quantum Steering Ellipsoid	Sania Jevtic	2013-03-26	Scientific Series	View details
12/13 PSI - Explorations on Quantum Information Lecture 7	David Cory	2013-03-26	Course	View details
Wick's theorem for Matrix Product states	Robert Huebener	2013-03-25	Scientific Series	View details
12/13 PSI - Explorations on Quantum Information Lecture 6	David Cory	2013-03-25	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 5	David Cory	2013-03-22	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 4	David Cory	2013-03-21	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 3	David Cory	2013-03-20	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 2	David Cory	2013-03-19	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 1	David Cory	2013-03-18	Course	View details
Neorealism and the Internal Language of Topoi	Sander Wolters	2013-03-12	Scientific Series	View details
Efficient Distributed Quantum Computing	Oliver Gray	2013-03-11	Scientific Series	View details

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Format results

12/13 PSI - Explorations on Quantum Information Lecture 8

The Quantum Steering Ellipsoid

12/13 PSI - Explorations on Quantum Information Lecture 7

Wick's theorem for Matrix Product states

12/13 PSI - Explorations on Quantum Information Lecture 6

12/13 PSI - Explorations on Quantum Information Lecture 5

12/13 PSI - Explorations on Quantum Information Lecture 4

12/13 PSI - Explorations on Quantum Information Lecture 3

12/13 PSI - Explorations on Quantum Information Lecture 2

12/13 PSI - Explorations on Quantum Information Lecture 1

Neorealism and the Internal Language of Topoi

Efficient Distributed Quantum Computing

12/13 PSI - Explorations on Quantum Information Lecture 8

The Quantum Steering Ellipsoid

12/13 PSI - Explorations on Quantum Information Lecture 7

Wick's theorem for Matrix Product states

12/13 PSI - Explorations on Quantum Information Lecture 6

12/13 PSI - Explorations on Quantum Information Lecture 5

12/13 PSI - Explorations on Quantum Information Lecture 4

12/13 PSI - Explorations on Quantum Information Lecture 3

12/13 PSI - Explorations on Quantum Information Lecture 2

12/13 PSI - Explorations on Quantum Information Lecture 1

Neorealism and the Internal Language of Topoi

Efficient Distributed Quantum Computing