Quantum Bayesian Networks

February 26, 2019

Seth Lloyd invented PennyLane. It’s a well known fact.

Filed under: Uncategorized — rrtucci @ 6:01 pm

I forgot to mention that Seth Lloyd invented PennyLane. The other people at Xanadu are all identical worker ants faithfully following his brilliant instructions on what to do, according to a Xanadu press release

Excerpt from press release:

“Deep learning libraries like TensorFlow and PyTorch opened up artificial intelligence to the world by providing an interface to powerful GPU hardware. With PennyLane, Xanadu is now doing the same for machine learning on quantum hardware,” said Seth Lloyd, Xanadu’s chief scientific advisor, MIT professor and a founding figure in both quantum computing and quantum machine learning. “We’re going to see an explosion of ideas, now that everyone can train quantum computers like they would train deep neural networks.”

Xanadu is a company whose “chief scientific advisor, MIT professor and a founding figure in both quantum computing and quantum machine learning”, Prof. Seth Lloyd, has promised to build a “continuous values” quantum computer device, which is a device invented by Seth Lloyd, according to him. This would be a quantum computer that is more analog and more classical than DWave’s. DWave, a qc company which was founded in 1999, 20 years ago, has never been able to provide error correction for its qc, so many experts believe that Xanadu’s Lloydian qc will be very difficult to error correct too. But if anyone can solve this prickly conundrum, it’s Seth Lloyd, who, according to him, is the original inventor of DWave’s device too.


Wow wee! Seth Lloyd’s invention, an optical computer that runs Tensorflow, is really taking off at MIT. I just came across this news report on a company called LightMatter, funded by some heavyweights like Google Ventures, that proposes to do just that.



Lightmatter just picked up its first backing from a corporate investor: GV, a venture arm of Google parent company Alphabet.

In 2014, Nick Harris and Darius Bunandar were trying to combine optical technology with quantum computing at the Massachusetts Institute of Technology, where they were doing Ph.D. work in the same research group.

But in 2015, Harris and Bunandar began looking at fields beyond quantum computing, including AI. “Our feeling is that there are a huge number of challenges that remain to be solved” for their quantum approach, Harris said.

“There is a lot of effort that goes into making this kind of device plug and play and making it look a lot like the experience of an Nvidia GPU,” Harris said. The team wants to ensure the chips work with popular AI software such as the Google-backed open-source project TensorFlow.


  1. This is a joke. Except it’s all “true”

    Comment by rrtucci — February 26, 2019 @ 6:18 pm

  2. Seth Lloyd practically invented Python too. His frequent contributions to github and stack overflow are legendary for their clarity and erudition. How could it be otherwise? AI is 90% computer programming, so the founding father of quantum AI must be a master programmer.

    Comment by rrtucci — February 26, 2019 @ 10:12 pm

  3. How about these news from the “ionic” front?

    Comment by technofeudalism — February 27, 2019 @ 8:26 am

  4. Thanks, techno. Yes, that is good news because the more competition, the merrier. IonQ, like IBM, Google and Rigetti, each already has its own functioning device. I doubt Xanadu will ever be able to produce a device that does useful calculations that cannot be done faster, more precisely and more cheaply on a cell phone.

    The fact that Xanadu portrays itself as a company that combines in its sofware both gate model quantum computing and continuous wave ANALOG computing is a big Lloydian CON JOB. The two subjects are very different from a complexity theory and error correction point of view. It’s disappointing that the academics claimed that DWave was not a real quantum computer and could not be error corrected fault tolerantly but they have stayed mum about Xanadu’s device, probably because Seth Lloyd is one of their own and they don’t want to express disagreement lest they be blackballed by other academics or by investors. Squeezed light has been around since the first paper by Yuen about 30 years ago. It has proven very difficult to squeeze light beyond a certain point and I don’t forsee Xanadu making any breakthroughts there. Besides, companies should ideally be started to commercialize an already existing main breakthrough, not in the hopes of stumbling on their main breakthrough after the company is created. It seems that Lloyd’s company is following the second approach. Theranos is an example of the second approach gone awry. It’s disappointing that academics like Seth Lloyd try to get rich conning investors. At least Larry Page figured out Lloyd’s insincerity immediately and kicked him out of that hot tub (in a figurative sense)

    Comment by rrtucci — February 27, 2019 @ 8:42 am

  5. Overall, people are getting anxious lately…

    Comment by technofeudalism — March 4, 2019 @ 9:17 am

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