Print 15 comment(s) - last by inighthawki.. on Mar 6 at 3:32 PM

Chilly chip achieves important quantum computing advance

University of California Santa Barbara Physics professor John Martinis is looking to trap sunshine in a bottle; or photons in a cavity, more precisely.  His former postdoctoral fellow Yi Yin -- now a professor at Zhejiang University in the city of Hangzhou, China -- has just published a work in the journal Phys. Rev. Letters detailing how her team used tiny superconducting structures to selectively trap and release photons.

Ms. Yin comments, "As one crucial step of achieving controllable quantum devices, we have developed an unprecedented level of manipulating light on a superconducting chip.  In our experiment, we caught and released photons in and from a superconducting cavity by incorporating a superconducting switch.  By controlling the switch on and off, we were able to open and close a door between the confined cavity and the road where photons can transmit. The on/off speed should be fast enough with a tuning time much shorter than the photon lifetime of the cavity."

The study uses a two-atom construct for the "qubit" (quantum bit) that stores the photon state information in the Fabry-Perot cavity.  The team uses a switchable mirror to act like a shutter, controlling the waveform of the released photons.

UCSB quantum chip
The UCSB superconducting quantum chip was chilled to three-hundreths of a degree Kelvin.

There were some rather significant technical hurdles that are required to achieve the team's impressive results.  The approximately 1 sq. inch chip had to be chilled to -273.12 ºC -- or about two-hundredths of a degree Kelvin above absolute zero.

The next step is to tune the device to transfer controlled-state photons between two cavities.  That will be a critical step towards quantum memory or a cavity-based quantum computing device.

Sources: UCSB, Phys. Rev. Letters

Comments     Threshold

This article is over a month old, voting and posting comments is disabled

RE: 0.02 or 0.03 K?
By MadMan007 on 3/5/2013 3:28:25 PM , Rating: -1

RE: 0.02 or 0.03 K?
By inighthawki on 3/5/2013 3:33:34 PM , Rating: 3
A terrible thing when someone nicely explains something for the rest of the world to learn from and gets met with sarcasm.

RE: 0.02 or 0.03 K?
By MadMan007 on 3/5/13, Rating: 0
RE: 0.02 or 0.03 K?
By ZmaxDP on 3/5/2013 9:16:59 PM , Rating: 3
It's sad when accuracy is confused with being nit-picky. Personally, I like it when someone "goes on" to explain why something isn't used instead of just correcting it's misuse.

RE: 0.02 or 0.03 K?
By inighthawki on 3/6/2013 3:32:24 PM , Rating: 2
My fault? Your post screams sarcasm. I guarantee 99% of people read your post as an insult, the equivalent of the common sarcastic insult, "thanks captain obvious"

"Paying an extra $500 for a computer in this environment -- same piece of hardware -- paying $500 more to get a logo on it? I think that's a more challenging proposition for the average person than it used to be." -- Steve Ballmer

Most Popular Articles5 Cases for iPhone 7 and 7 iPhone Plus
September 18, 2016, 10:08 AM
No More Turtlenecks - Try Snakables
September 19, 2016, 7:44 AM
ADHD Diagnosis and Treatment in Children: Problem or Paranoia?
September 19, 2016, 5:30 AM
Walmart may get "Robot Shopping Carts?"
September 17, 2016, 6:01 AM
Automaker Porsche may expand range of Panamera Coupe design.
September 18, 2016, 11:00 AM

Copyright 2016 DailyTech LLC. - RSS Feed | Advertise | About Us | Ethics | FAQ | Terms, Conditions & Privacy Information | Kristopher Kubicki