Quantum Bayesian Networks

March 23, 2011

To the Rescue, Musketeers! To the Rescue!

Filed under: Uncategorized — rrtucci @ 3:39 am

“All for one, one for all!” (“Tous pour un, un pour tous!”).

RezQu is a family of devices and architecture for a scalable quantum computer based on superconducting phase qubits. RezQu is being developed by a UCSB (U. of California, Santa Barbara) team of swashbuckling musketeers led by Athos Martinis and Porthos Cleland. The team’s intentions are to RezQu Moore’s Law from Cardinal Siliconlieu’s guards. The team recently described their work at the APS (American Physical Society) meeting held on March 2011 at Dallas TX.

The APS meeting had many sessions on diverse quantum information topics. The website for the meeting allows searching by author. A search for “Martinis” revealed that Martinis was a coauthor in 13 of the mini-talks of the conference. Mon Dieu! C’est beaucoup de travail!

Session D27: Superconducting Qubits – Gates and Algorithms had quatre mini-talks on RezQu

  • “Scaling Superconducting Qubits with the ResQu Architecture”, by John Martinis
  • “Experimental demonstration of quantum algorithms on a 4-qubit/5-resonator quantum microprocessor utilizing superconducting qubits in the RezQu architecture”, by Erik Lucero, Rami Barends, Radoslaw Bialczak, Yu Chen, Julian Kelly, Mike Lenander, Matteo Mariantoni, Anthony Megrant, Aaron O’Connell, Peter O’Malley, Daniel Sank, Amit Vainsencher, Hauhoa Wang, James Wenner, Ted White, Yi Yin, Jian Zhao, Andrew Cleland, John Martinis
  • “Quantum Logic Gates for the Rezqu Architecture”, by Joydip Ghosh, Michael Geller (both from U. of Georgia)
  • “Idling error and SWAP/MOVE operation in RezQu architecture for phase qubits”, by Andrei Galiautdinov, Alexander Korotkov (both from U. of Calif. Riverside)

Session D29: Quantum Computing and Simulation I had one mini-talk on planned software for the RezQu platform. Logiciels, ma spécialité!

  • “General-Purpose Quantum Simulation with Prethreshold Superconducting Qubits”, by Emily Pritchett, Colin Benjamin, Andrei Galiautdinov, Michael Geller, Andrew Sornborger, Phillip Stancil, John Martinis

Check out BBC’s reportage on RezQu

Quantum computing device hints at powerful future
By Jason Palmer (BBC, 22 March 2011)

Some excerpts from the BBC article:

The 6cm-by-6cm chip holds nine quantum devices, among them four “quantum bits” that do the calculations.
The team said further scaling up to 10 qubits should be possible this year.

The team’s key innovation was to find a way to completely disconnect – or “decouple” – interactions between the elements of their quantum circuit.
The delicate quantum states that they create must be manipulated, moved, and stored without destroying them.

“It’s a problem I’ve been thinking about for three or four years now, how to turn off the interactions,” UCSB’s John Martinis, who led the research,” told BBC News.
“Now we’ve solved it, and that’s great – but there’s many other things we have to do.”

“There’s already promise to show how this architecture could scale, and we’ve created custom electronics based on cellphone technology which has driven the cost down a lot.

I wrote a previous blog post about UCSB’s QC effort:

Quantum Computing’s American Riviera

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