Soumis par Anonymous le Juin 18, 2013 - 8:51am

We introduce two relative entropy quantities called the min- and max-relative

entropies and discuss their properties and operational meanings.

These relative entropies act as parent quantities for tasks such as data compression, information

transmission and entanglement manipulation in one-shot information theory. Moreover, they lead us to define entanglement monotones which have interesting operational interpretations.

Soumis par Anonymous le Juin 13, 2013 - 11:13am

Shor's algorithm can be a meaningful test for experimental quantum processing systems, when suitably realized. I present results from a recent implemenation of quantum factoring using trapped ion qubits, demonstrating feed-forward control, use of quantum memory during computation, and cascaded three-qubit gates. Such capabilities are necessary ingredients for a future large-scale,

fault-tolerant quantum computing system.

Soumis par Anonymous le Juin 7, 2013 - 9:20am

While quantum measurement remains the central philosophical conundrum of quantum mechanics, it has recently grown into a respectable (read: experimental!) discipline as well. New perspectives on measurement have grown out of new technological possibilities, but also out of

attempts to design systems for quantum information processing, which promise to be exponentially more powerful than any possible classical computer. I will try to give a flavour about some of these perspectives, focussing largely on a particular paradigm known as "weak measurement."

Soumis par Anonymous le Mai 30, 2013 - 8:55am

I describe some tentative new ideas on modified

versions of quantum theory motivated by the path integral formalism, and on

other generalizations, and comment on possible experimental implications.

Soumis par Anonymous le Mai 28, 2013 - 9:10am

Expressions of several information theoretic quantities involve an optimization over auxiliary quantum registers. Entanglement-assisted version of some classical communication problems provides examples of such expressions. Evaluating these expressions requires bounds on the dimension of these auxiliary registers. In the classical case such a bound can usually be obtained based on the

Soumis par Anonymous le Mai 28, 2013 - 9:10am

I will present a recent theorem that asserts that there cannot exist an "extension of quantum theory" that allows us to make more informative predictions about future measurable events (e.g., whether a horizontally polarized photon passes a polarization filter with a given orientation) than standard quantum theory.

Soumis par Anonymous le Mai 15, 2013 - 12:23pm

This panel will explore some of the deepest questions facing those who would harness the power of quantum mechanics in new quantum technologies: What are the newest and most interesting discoveries researchers have made about quantum information? What progress has been made in recent years towards experimentally harnessing quantum devices for quantum computation? What are the main motivations for building quantum information processing technologies? Drs. Aharonov and Shor appear courtesy of Institute for Quantum Computing.

Soumis par Anonymous le Mai 14, 2013 - 9:00am

We

show that particle detectors, such as 2-level atoms, in non-inertial motion (or

in gravitational fields) could be used to build quantum gates for the

processing of quantum information. Concretely, we show that through

suitably chosen non-inertial trajectories of the detectors the interaction

Hamiltonian's time dependence can be modulated to yield arbitrary rotations in the

Bloch sphere due to relativistic quantum effects.

Ref. Phys.

Rev. Lett. 110, 160501 (2013)