Go Back   nV News Forums > General Forums > Archived News Items

Newegg Daily Deals

Thread Tools
Old 06-06-12, 06:30 PM   #1
Registered User
Join Date: Jun 2009
Posts: 56,607
Post Trapping flying qubits in a crystal (and getting them back out)

A titanium sapphire crystal, used as an optical element in a laser.

Quantum computers come in many different shapes and forms, but the granddaddy of them all is based on light. This is because it is very easy to create the basic computational unit, called a qubit, from light. The big problem is the memory unit. Light has a pesky habit of traveling quite fast, so by the time you are ready to use your carefully prepared qubit, it is halfway to the Moon, never to return.

A pair of research groups, working independently, showed an effective and reliable memory for light-based qubits. Looking back, a number of competing research groups will be hitting themselves on the forehead, saying, "why didn't we think of that?" Yes, the idea is that simple'though I should caution that there is some distance between an idea and its implementation.

There are three key elements that make a quantum computer special: superposition, coherence, and entanglement. A qubit that is in a superposition state does not represent a logic one or zero; instead, it represents the probability of measuring it as a logic one. Coherence is essentially how the superposition state of different qubits change synchronously with each other. Entanglement takes two or more particles and makes them (mathematically speaking) a single particle. So when we are choosing a qubit system, we must choose physical properties that can be entangled between different particles and remain coherent.

Read more | Comments

News is offline   Reply With Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -5. The time now is 07:11 PM.

Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright 1998 - 2014, nV News.