Single Atom Quantum Memory

The storage and regeneration of quantum qubits is is essential for the development of quantum computing and communications systems. Today, Holger Specht and colleagues at the Max Planck Institute for Quantum Optics in Garching, Germany, have found a way to store the qubit from a polarized photon in a single atom of rubidium and then release it again later.


(Single Atom Quantum Memory)
a, A single atom (1) (the inset shows a typical fluorescence image) is trapped at the centre of a high-finesse optical cavity using a far-detuned standing-wave dipole trap (2). b, An impinging weak coherent pulse (3) with arbitrary polarization is converted into an atomic spin excitation using a pi-polarized pump laser (4). c, This maps the photonic polarization qubit onto a long-lived superposition of the ground states of the atom. d, After a variable storage time, the polarization qubit is retrieved by the production of a single photon (5).

The trick here is first to find an atom with the suitable two-level state that will absorb photons in the right way and second, to find a way to force the photon to give up its qubit to the atom.

It turns out that rubidium has the just right energy levels. Specht and co force the atom and photon to interact by trapping them in a high quality mirrored cavity in which the photon can enter but not easily escape. It then rebounds inside until it gives up its goods to the atom.

To accept the qubit, the atom first has to be placed in the right state by a weak laser beam. A second laser beam later forces the atom to spit out the qubit in the form of an identical polarised photon.

The result is a single atom memory that can read, store and write quantum information.

The notion that a single atom could be used as a storage device is one that I first encountered while reading science fiction. In his 1951 novel Between Planets, Robert Heinlein writes about a molecule matrix:

"It is theoretically possible to have a matrix in which each individual molecule has a meaning - as they do in the memory cells of your brain. If we had such subtlety, we could wrap your Encyclopedia Britannica into the head of a pin - it would be the head of that pin..."
(Read more about Heinlein's molecule matrix)

ReadmTechnology Review for more details.

Scroll down for more stories in the same category. (Story submitted 3/15/2011)

Follow this kind of news @Technovelgy.

| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |

Would you like to contribute a story tip? It's easy:
Get the URL of the story, and the related sf author, and add it here.

Comment/Join discussion ( 1 )

Related News Stories - (" Computer ")

Neuralink Will Land A Chip In Your Brain
'What are you talking about? Do you mean a neural lace?' - Iain M. Banks, 2010.

100 Terabyte Exadrive SSD Also Has Biggest Price
'A man could carry AIs or complete planetary dataspheres in a Schrön loop.' - Dan Simmons, 1989.

Google Now Expects Chips To Design Themselves
'What lay down there? Energy, tubes and pipes, wiring, transformers, self-contained machinery...' - Philip K. Dick, 1960.

Neuromorphic Computing Hardare
'He had constructed an organ, a brain, of metal, entirely inorganic and lifeless...' - Edmond Hamilton, 1926.

 

Google
  Web TechNovelgy.com   

Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Invention Timeline, or see what's New.

 

 

 

 

 

Current News

Salto Jumping Robot Now Sticks Landing!
'Lucky touched the leap knob and the hopper's leg retracted.'

Gyroscopic Median-Straddling Mass Transit Vehicles
'It was among these leviathans that the little gyrocar was daring to thrust its puny self...'

Bigrating Laser Beam-Riding Light Sail Is Self-Correcting
'That sail will be twenty thousand miles at the wide part.'

ISS Astronauts Test Estee Lauder 'Advanced Night Repair' Skin Serum
'Out in the New Moon, just ask for what you want...'

LG Wing Twisting Smartphone Might Be Fun
'A polycarbon screen unfurled...'

Mushroom Coffin Returns You To Nature, Naturally
'She touched the leaf. She was wanted.'

Will ATT Offer Ad-Subsidized Cellphone Service
'For long-distance calls the ratio of commercial to conversation was as high as 10 to 1...'

Gyro-X Self-Balancing Two-Wheeler Car
'Indeed, the gyrocar was a sight to make a man look twice.'

Beat Covid-19 With AIR By MicroClimate - At Last I Get My PAPR
More than just a bubble.

Mi TV LUX Transparent Edition OLED TV
The Look of Things To Come.

Metalenses Now Reconfigurable With Liquid Crystal
'Hufhuf oil held in static tension...'

'Alexa For Residential' A Landlord's Dream (Tenant's Nightmare?)
'...unseen mechanical entities... that are in our very midst. One of them following each of us.'

Gather Ye Moonrocks While Ye May
'The law of filing on newly discovered asteroids was definite.'

InMotion V11 Electric Unicycle Gets Air (Video)
'A tumblebug does not give a man dignity...'

Rid Thyself Of Ads On The Newsbox
'Can't we scramble that commercial?'

A.I. Jesus Proclaims Machine Gospel
'... he crossed the waiting room to the Padre booth; inside he put a dime into the slot and dialed at random.'

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise |
Technovelgy.com - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.