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Frédéric Grosshans
@fgrosshans
, 5 tweets, 2 min read Read on Twitter
Seated for a seminar on “Quantum Information Technology for Network”, by Qin Hai, from CAS Quantum Network Co., ltd, in Shanghai. This talk will essentially be focused on Chinese progress
#LTQI
Qin Hao: The chinese quantum satellite Micius has 3 mission. 1/ Act as a trusted quantum node, with QKD rate of 1 kbps (recently 400 kbps) ; 2/ Distribute entanglement between 1200km distant locations; 3/ Groud to satellite quantum state teloprtation
#LTQI
Qin Hao: The goal of the Chines Beijing–Shanghai 2000km QKD backbone is to have actual users. A next step (underway) is extend the backbone across China. And beyond, using satellites
#LTQI
Qin Hao: This network is based on trusted node technology. #LTQI
Qin Hao: There are several ongoing work on quantum information standardization, recently at ITU, ISO , IEEE, and for a long time at IETF (2009, but draft), ETSI (2008, 6 specifications) but the progress of the two latter efforts is slow
#LTQI
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More from @fgrosshans see all

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Frédéric Grosshans
@fgrosshans
Seated for a talk by Mathieu Bozzio, on "Towards trusting your local Franprix's payment terminal..." a.k.a. “Money money money, must be funny, in a quantum world !”.

Joint work with Eleni Diamanti and myself, arXiv:1812.09256 arxiv.org/abs/1812.09256
#LTQI
Mathieu Bozzio: in the 1970s, Stephen Wiesner invented a quantum banknotes scheme, with security based on the no-cloning theorem.
Mint→Client→Bank

For quantum credit cards, there is classical communication between the Merchant and Bank:
Mint→Client→Merchant→Bank
#LTQI
Mathieu Bozzio’s approach : the attack cooresponds ti minimizing losses & error using convex optimization. To be practical, we use coherent states, with the following mapping
|0⟩→|α⟩⊗|vac⟩ ; |1⟩→|vac⟩⊗|α⟩
|±⟩→|α/√2⟩⊗|±α/√2⟩
|±i⟩→|α/√2⟩⊗|±iα/√2⟩
#LTQI
Read 6 tweets
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Frédéric Grosshans
@fgrosshans
Now seated for a seminar by Antoine Grospellier, from @inria_paris, on Constant overhead quantum fault-tolerance with quantum expander codes.

Associated paper: arXiv:1808.03821 arxiv.org/abs/1808.03821
#LTQI
@inria_paris Antoine Gropellier recalls the principle of quantum fault tolerance with concateneated Steane codes. Without correction, with error probability p, a circuit C, |C| gates and m qubits, Pr(wrong output)≤p|C|,
With code, 7m qubits, ≤c₀|C| gates, Pr(wrong)≤cp²|C|
#LTQI
@inria_paris Antoine Grospellier: with n iteration, 7ⁿm qubits, ≤c₀ⁿ|C| gates, Pr(Wrong)≤|C| (cp)^2ⁿ /c
This doubly exponenetial scaling of the error translates into a polylog(ε) scaling of the space overhead with the errors.
Ou main interest here is thii overhead
#LTQI
Read 11 tweets
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Frédéric Grosshans
@fgrosshans
Seated for a seminar by Francesco Arzani on his work with Nicolas Treps and Giulia Ferrini on
Polynomial approximation of non-Gaussian unitaries by counting one photon at a time (arXiv:/1703.06693 arxiv.org/abs/1703.06693 / PRA 95 052352 dx.doi.org/10.1103/PhysRe… )
#LTQI
Francesco Arzani: It’s difficult to define computation in a continuous variable (CV) set-up. People usually chose specific encoding of qubits. But Francesco (and myself!) finds encoding independent definitions more interesting.
#LTQI
Francesco Arzani: we are interested in the transformation exp(i H(q,p)).
A universal state should be bale to approximate any polynomial hamiltonian. arXiv:quant-ph/9810082 arxiv.org/abs/quant-ph/9… / PRL 82 1784 doi.org/10.1103/PhysRe… gave an example with quadratic gates + 1 cubic
Read 9 tweets

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Dr Mona Sloane
@mona_sloane
@AOC is right: technology reflects society. Here is an incomplete list of experts you should follow if you are interested in this topic / thread:
@safiyanoble – read her great book ‘Algorithms of Oppression – How Search Engines Reinforce Racism’ nyupress.org/books/97814798… with @NYUpress
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@40_head
1.@Americanlll @Dina1trump @MastersShelby @RealEyeTheSpy @TomFitton @GenFlynn @nikkihaley @_ImperatorRex_ @O_IrishT @prayingmedic @SarahPalinUSA @PatriotPlaceATX @qanon76 @WeAreOne_Q @Cordicon @StateDept

Interesting how so much has been "swept under the rug" with the #Clintons.
2. We knew there was a lot going on with the #Chinese, the #ClintonFoundation, #HRC (hillary) and #BC (bill). More so, why'd #Hussein (obama) allow this to happen? Note, it wasn't until 2009 that a billionaire Chinese felon, convicted of illegally funding #BC's campaign, got a...
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Matthew Willemsen
@mwill_crypto
0/ #Crypto ending the week with a full head of steam. Not ready for the weekend just yet!

Here's the latest from the #cryptocurrency/#blockchain space over the past 24 hours or so...
1/ 🔧 @POANetwork [ $POA ], @CompoundFinance, and @ConsenSys have teamed up to develop Mana, an open source, full node #Ethereum client written in Elixir, a programming language that runs on Erlang Virtual Machine (i.e., BEAM).

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The Big White Lie
@ErrantNatives
#Chinese. #Drones. #Rhinos
The narrative is that "Africans poach" We do not. The truth is that Chinese in #Laikipia are a threat for locals, for Rhinos & Elephants. #Kenyans need to be on high Alert.
Thanks Micheal
@UKenyatta
#thebigwhitelie
#thebigconservationlie
#POACHING
Unfortunately, Chinese are invading #Meru as well - another Rhino Sanctuary through #thebigwhitelie of 'investing in' a 5 star hotel. Can we stop this via civil suit before Gov.Kiraitu Murungi @SenKiraitu sells our Heritage?
@MuthoniMicheni @alaminkimathi @muhimu07
MERU, KENYA: "Mayor Liu Xiaohua of Huangshan Municipal from #China has led a delegation of Chinese investors who want to build tourist resorts in Mt Kenya - To @SenKiraitu - this is a DANGEROUS move.

#thebigwhitelie
#thebigconservationlie
#Poaching
standardmedia.co.ke/business/artic…
Read 3 tweets
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[intheMatrixxx]
@intheMatrixxx
#QAlert 8/10/18 This will be my THREAD for all Q’s posts for Friday, August 10, 2018. Knowing what you know now..... and more!

Let’s Go!
@POTUS #QAnon #QArmy #WWG1WGA #PatriotsUnited #Haiti
1831
Does @POTUS make statements that are false?
Knowing what you know now…..
[Start @ 12:00]
📁
Think Haiti [14:40]
Think Watergate Commission [removed_why_investigate].
Listen very carefully.
TRUTH.
Surrounded by EVIL.
NEVER STOP PRAYING.
WWG1WGA!!!!!!
Q
#QAlert 8/10/18 Q1832
Re_read drops re: Haiti.
At some point it will not be safe for them to walk down the street.
PURE EVIL.
HOW MANY IN WASHINGTON AND THOSE AROUND THE WORLD (IN POWER) WORSHIP THE DEVIL?
Conspiracy?
Fake News?
The World is WATCHING.
Q
@POTUS #QAnon #QArmy
Read 22 tweets

Trending hashtags

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