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Member Since 17 Oct 2007
Offline Last Active Aug 01 2013 09:31 PM

Scientist manage to create quantum entanglement on diamonds

02 December 2011 - 05:35 PM

Surprized there wasn't a thread on this.

Scientists have linked two diamonds in a mysterious process called entanglement that is normally only seen on the quantum scale.

Entanglement is so weird that Einstein dubbed it "spooky action at a distance." It's a strange effect where one object gets connected to another so that even if they are separated by large distances, an action performed on one will affect the other. Entanglement usually occurs with subatomic particles, and was predicted by the theory of quantum mechanics, which governs the realm of the very small.

But now physicists have succeeded in entangling two macroscopic diamonds, demonstrating that quantum mechanical effects are not limited to the microscopic scale.

"I think it's an important step into a new regime of thinking about quantum phenomena," physicist Ian Walmsley of England's University of Oxford said."That is, in this regime of the bigger world, room temperatures, ambient conditions. Although the phenomenon was expected to exist, actually being able to observe it in such a system we think is quite exciting."

Another study recently used quantum entanglement to teleport bits of light from one place to another. And other researchers have succeeded in entangling macroscopic objects before, but they have generally been under special circumstances, prepared in special ways, and cooled to cryogenic temperatures. In the new achievement, the diamonds were large and not prepared in any special way, the researchers said.

"It's big enough you can see it," Walmsley told LiveScience of the diamonds."They're sitting on the table, out in plain view. The laboratory isn't particularly cold or particularly hot, it's just your everyday room."

Walmsley, along with a team of physicists led by Oxford graduate student Ka Chung Lee, accomplished this feat by entangling the vibration of two diamond crystals. To do so, the researchers set up an apparatus to send a laser pulse at both diamonds simultaneously. Sometimes, the laser light changed color, to a lower frequency, after hitting the diamonds. That told the scientists it had lost a bit of energy.

Because energy must be conserved in closed systems (where there's no input of outside energy), the researchers knew that the "lost" energy had been used in some way. In fact, the energy had been converted into vibrational motion for one of the diamonds (albeit motion that is too small to observe visually). However, the scientists had no way of knowing which diamond was vibrating.

Then, the researchers sent a second pulse of laser light through the now-vibrating system. This time, if the light emerged with a color of higher frequency, it meant it had gained the energy back by absorbing it from the diamond, stopping its vibration.

The scientists had set up two separate detectors to measure the laser light — one for each diamond.

If the two diamonds weren't entangled, the researchers would expect each detector to register a changed laser beam about 50 percent of the time. It's similar to tossing a coin, where random chance would lead to heads about half the time and tails the other half the time on average.

Instead, because the two diamonds were linked, they found that one detector measured the change every time, and the other detector never fired. The two diamonds, it seemed, were so connected they reacted as a single entity, rather than two individual objects.

The scientists report their results in the Dec. 2 issue of the journal Science.

"Recent advances in quantum control techniques have allowed entanglement to be observed for physical systems with increasing complexity and separation distance," University of Michigan physicist Luming Duan, who was not involved in the study, wrote in an accompanying essay in the same issue of Science."Lee et al. take an important step in this direction by demonstrating entanglement between oscillation patterns of atoms—phonon modes—of two diamond samples of millimeter size at room temperature, separated by a macroscopic distance of about 15 cm."

In addition to furthering scientists' understanding of entanglement, the research could help develop faster computers called photonic processors, relying on quantum effects, said Oxford physicist Michael Sprague, another team member on the project.

"The long-term goal is that if you can harness the power of quantum phenomena, you can potentially do things more efficiently than is currently possible," Sprague said.


.NET Framework error?

11 June 2011 - 03:52 PM

Hey everyone, it's me again <_< .

Recently, while trying to install stalker: Call of Pripyat, I got an error message that said I need to install .Net Framework v4.0.30319. I thought it might have been a problem with that game, but today I got it again while trying to install a DX11 Benchmark, and again when trying to install Metro2033.

The thing is I already have that version of .Net Framework installed. Just to make sure, I downloaded it again, and the client Client Profile, installed both again, but it didn't help. I'm on Windows 7 Ultimate 64 bit. I've already searched for sollutions to this problem, but couldn't find any that fixed it.

Thanks in advance.

Stuck in 1600x1200 resolution

01 June 2011 - 10:13 PM

Hey everyone! I've never posted in this sub-forum before so I hope I'm not breaking any rules.

I'm currently using a 42' Tv as a screen for my computer. The Tv supossedly is 1080p, but when I try to configure the resolution the highest it will let me go is 1600x1200.

My GPU is a GeForce GTX 550 Ti, which should support higher resolutions. My drivers are up to date, I tried reinstalling them too, just in case.

Now, I was wondering if it has anything to do with me not using an HDMI cable. I'm currently using a VGA, but I don't know if that makes a difference or not.

Thanks in advance!

Amnesia: The Dark Descent

13 September 2010 - 01:08 AM

Taken from the official website: http://www.amnesiagame.com/#main

Amnesia: The Dark Descent is a first person horror game with a focus on immersion. It is a game where atmosphere and story comes first. We hope that the game will be a breeze of fresh air, in a genre otherwise populated by "one-man-army action hero" sagas. In Amnesia you are almost completely defenseless, something we believe not only makes the game a lot scarier, but also gives a vastly different experience.

Enter an interactive nightmare where reality is a fragile concept.

Posted Image

Amnesia puts you in the shoes of Daniel as he wakes up in a desolate castle, barely remembering anything about his past. Exploring the eerie pathways, you must also take part of Daniel's troubled memories. The horror does not only come from the outside, but from the inside as well. A disturbing odyssey into the dark corners of the human mind awaits.

By using a fully physically simulated world, cutting edge 3D graphics and a dynamic sound system, the game pulls no punches when trying to immerse you. Once the game starts, you will be in control from the beginning to the end. There are no cut-scenes or time-jumps, whatever happens will happen to you first hand.

Amnesia: The Dark Descent throws you headfirst into a dangerous world where danger can lurk behind every corner. Your only means of defense are hiding, running or using your wits.

Do you have what it takes to survive?

Here are some trailers:




Those of you familiar with Penumbra's physics system should have no trouble understanding the logic behind puzzles, hiding, and moving arround. The horror style remains the same, rather than relying on jump scares, it creates an immersive atmosphere which blurs the line of reality, making you wonder if that noise you just heard behind you is real, or if it's just the game playing tricks on you.

Efficient herblore training.

09 September 2010 - 09:19 PM

Hey everyone!

I'm making this thread because I have decided to cancel my membership for now, and I would like to burn all my money (63M, I'm poor, I know it) on herblore. I have been away from Runescape for some weeks, and seeing as the current herbs and potions prises are a mess, I would like to know what would be the best way to get my herblore as high as possible.

My current herblore level is 71.

Thanks in advance!