ITP-quantumseminare

itp-quantumseminare@lists.phys.ethz.ch

1 participants
1357 discussions

tomorrow's talk
by Roger Colbeck 03 Mar '08

03 Mar '08

Hi all, Tomorrow's talk will be by Viktor at 5pm in the Pauli Room. See you there, Roger Title: Simulating Quantum Correlations with finite Communication (RT07) It is well known that measurements on quantum states may reveal some behaviour which cannot be produced classically. The last 15 years people have tried to quantify this 'non-local part' using several information theoretic primitives such as NL-boxes or classical bits used for communication. In 2003 Bacon and Toner could show that 1 classical bit of one-way communication suffices to simulate the EPR-pair setup for arbitrary 2-outcome measurements. In 2007, Regev and Toner could show that 2 classical bits of communication suffice to simulate quantum correlations on a (known) bi-partite state of dimension d x d with 2-outcome measurements. Surprisingly, only 2 bits of communication is needed (independent of the dimension d). Nevertheless, even though quantum correlations $\alpha \beta$ can be simulated, their protocol does not yield correct marginals. Not much is known beyond these cases. In this talk we will give a brief sketch of the techniques used by Regev and Toner.

1 0

Research Day plus Movie and Jazz
by Roger Colbeck 21 Feb '08

21 Feb '08

Hi all, For next Tuesday's talk we have a visitor, Andre Methot. The talk will be at 5pm in the Pauli room (title and abstract below). Also, Viktor is arranging a post-talk Movie and Jazz evening (see his message below). Cheers, Roger Title: Entanglement simulations and channels. Abstract: We will study the different entanglement simulation models: their structure, their motivation and the links that brings them all together. We will then introduce a novel idea. Linking them to classical and quantum channels. -------- Original Message -------- Subject: Research Day After Hour - Movie and Jazz Date: Wed, 20 Feb 2008 20:17:08 +0100 From: Galliard Viktor <viktor.galliard(a)inf.ethz.ch> To: <itp-quantumseminare-bounces(a)phys.ethz.ch>, <qi(a)lists.inf.ethz.ch> Hi all. After 1 1/2 years (!!) Stefans QI group (hopefully) managed to fix a date and movie for the first (official) QI Movie Evening. This will take place after the Research Day @ Hoenggerberg next Tuesday. Some of us will continue socializing at a 'cosy' Jazz concert @ Helsinki. I look forward for some people to join. Cheers, Viktor

1 0

[QI] QI Seminar
by Dejan D. Dukaric 18 Feb '08

18 Feb '08

Dear All, The next QI Seminar is on Tuesday afternoon, February 19 at 2 pm (IFW D42) by David Gablinger who will present his Master Thesis (note new time and room!) Title: "Irreversibility in an open qubit bath model" Cheers, Dejan

2 1

Thursday's Talk: change of time
by Roger Colbeck 11 Feb '08

11 Feb '08

Mario's talk on state merging has been shifted to 10:30am this Thursday and will be in the Pauli Room. See you there, Roger

1 0

Next week's research day NOTE the day
by Roger Colbeck 07 Feb '08

07 Feb '08

Next week's research day has provisionally been scheduled for Thursday. Please complain to me if this is a problem. If a significant number of people object we can change it. The talk has been scheduled at 11am on Thursday 14th February, abstract below. Cheers, Roger Single-shot quantum state merging I will introduce the task of quantum state merging and give a protocol for this task which has been shown to require at least a certain amount of entanglement. We have shown that the amount of entanglement consumed by this protocol is optimal.

1 1

Seth Lloyd QI Live
by dahlsten＠phys.ethz.ch 04 Feb '08

04 Feb '08

Dear all, You can also watch a talk by Seth Lloyd at Imperial live over the web on Wednesday-see details below. You would go to www.imperial.ac.uk/quantuminformation on the day, but make sure you have realplayer installed first. Cheers, Oscar > Hi there > We have a seminar this week: > Seth Lloyd > > > Wednesday 6/2/2008 at 14.30. > > IMS seminar room. > > > Non-quantum gravity > > > The application of concepts of quantum information to the problem of measuring spacetime geometry suggests that the spacetime metric should not be quantized. Instead, what is quantum are the clocks and signals that determine the metric. This talk presents a non-quantum theory of gravity. In this theory, intervals of space and time are derived from the states of quantum fields: the metric itself is not quantized. In non-quantum gravity, gravitational fields inherit the quantum fluctuations of the underlying quantum fields, leading to a systematic treatment of the back-reaction problem. The theory makes concrete predictions: in particular, the non-quantum gravitational fields do not exhibit independent zero-point fluctuations, predicting a suppression of tensor modes of the cosmic microwave background. Although the talk deals with quantum gravity, it will be accessible to anyone with a background in quantum information, too. ________________________________ From: tqo-bounces(a)imperial.ac.uk [mailto:tqo-bounces@imperial.ac.uk] On Behalf Of Retzker, Alexander Sent: 01 February 2008 23:51 To: Hartmann, Michael J; sougato.bose(a)qubit.org; tqo; Ho, Andrew F C K; tmrhm2003(a)yahoo.co.jp; pivanov(a)phys.uni-sofia.bg; mamdouh_abbara(a)hotmail.com; Dawson, Christopher M; andrew.fisher(a)ucl.ac.uk; Evans, Tim S; Pregnell, Kenneth L; Parker, Kim H; d.m.appleby(a)qmul.ac.uk; scsp(a)physto.se; bayat(a)physics.sharif.ir; Serafini, Alessio; Etienne Brion; Knight, Peter L; Owari, Masaki; Navascues, Miguel; Knight, Peter L; lane.hughston(a)kcl.ac.uk; Brody, Dorje C; Buhmann, Stefan Y Subject: [tqo] Seminar Hi there We have a seminar this week: Seth Lloyd Wednesday 6/2/2008 at 14.30. IMS seminar room. Non-quantum gravity The application of concepts of quantum information to the problem of measuring spacetime geometry suggests that the spacetime metric should not be quantized. Instead, what is quantum are the clocks and signals that determine the metric. This talk presents a non-quantum theory of gravity. In this theory, intervals of space and time are derived from the states of quantum fields: the metric itself is not quantized. In non-quantum gravity, gravitational fields inherit the quantum fluctuations of the underlying quantum fields, leading to a systematic treatment of the back-reaction problem. The theory makes concrete predictions: in particular, the non-quantum gravitational fields do not exhibit independent zero-point fluctuations, predicting a suppression of tensor modes of the cosmic microwave background. Although the talk deals with quantum gravity, it will be accessible to anyone with a background in quantum information, too. Best, Alex. _______________________________________________ tqo mailing list tqo(a)imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/tqo

1 0

this week's seminar
by Roger Colbeck 04 Feb '08

04 Feb '08

Dear all, For this week's talk, I will give a brief recap of what I said last time, then continue by explaining how to get information in and out of the toric code, what self correction in such a system means and show that excitations of the torus act like anyons (which will be introduced). The talk will be in IFW at 5pm. I will aim to take 30mins, as you already heard from me last week! See you there, Roger

1 0

tomorrow's talk
by Roger Colbeck 28 Jan '08

28 Jan '08

Dear all, Tomorrow's talk will be in the Pauli Room in HPZ at 17:00. I will give an introduction to Kitaev's toric code for error correction, explaining why it is especially resilient to noise. I will then explain the concept of self-correction, where we have recently shown that all stabilizer codes defined on a 2D torus are not self-correcting. Hope to see you there! Roger

1 0

[QI] QI Seminar
by Dejan D. Dukaric 18 Jan '08

18 Jan '08

Dear All, Sorry, I have sent you the wrong title :-) Here is the right one: Title: "Introduction to Multi-Prover Interactive Proof Systems and Parallel Repetition with Classical and Entangled Provers" Cheers, Dejan

1 0

[QI] QI Seminar
by Dejan D. Dukaric 18 Jan '08

18 Jan '08

Dear All, The next QI Seminar is on Tuesday afternoon, January 22 at 5 pm (IFW E44) by Dejan Dukaric. The talk will be an introduction to parallel repetition with a main focus on the related theoretical computer science questions. Title: "Introduction to Parallel Repetition with Classical and Entangled Provers" Cheers, Dejan

1 0

Jump to page:

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

ITP-quantumseminare