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Tag: quantum physics

Doing more with less: New technique efficiently finds quantum wave functions

Doing more with less: New technique efficiently finds quantum wave functions

August 28, 2014

University researchers have introduced a new method, called compressive direct measurement, that allowed the team to reconstruct a quantum state at 90 percent fidelity using only a quarter of the measurements required by previous methods.

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Entangled photons make a picture from a paradox

Entangled photons make a picture from a paradox

August 27, 2014

Physicists have devised a way to take pictures using light that has not interacted with the object being photographed. This form of imaging uses pairs of photons, twins that are ‘entangled’ in such a way that the quantum state of one is inextricably linked to the other.

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Duality principle is ‘safe and sound’

Duality principle is ‘safe and sound’

August 26, 2014

Decades of experiments have verified the quirky laws of quantum theory again and again. So when scientists in Germany announced in 2012 an apparent violation of a fundamental law of quantum mechanics, a physicist at the University of Rochester was determined to find an explanation.

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Duality principle is “safe and sound”: Researchers clear up apparent violation of quantum mechanics’ wave-particle duality

August 25, 2014

When scientists in Germany announced in 2012 an apparent violation of a fundamental law of quantum mechanics, The results were both “strange” and “incredible.” It took Robert Boyd and his colleagues nearly a year and a half to figure out what was going on.

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Physicists map path of quantum particles for first time ever

Physicists map path of quantum particles for first time ever

August 11, 2014

“It’s a great breakthrough in terms of being able to monitor quantum systems,” Andrew Jordan, a physicist at the University of Rochester, who worked on the original theory, told Live Science. “We’re just scratching the surface of the kinds of physics permitted here.”

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Quantum particles take the road most traveled

Quantum particles take the road most traveled

August 6, 2014

Physicists have developed a way to isolate the wacky quantum world and peer into it in a noninvasive way; this allows them to map the path that particles are most likely to take when changing from one state to another. “It’s a great breakthrough in terms of being able to monitor quantum systems,” Andrew Jordan, a physicist at the University of Rochester, who worked on the original theory, told Live Science. “We’re just scratching the surface of the kinds of physics permitted here.”

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Particle measurement sidesteps uncertainty principle

Particle measurement sidesteps uncertainty principle

August 6, 2014

Quantum mechanics imposes a limit on what we can know about subatomic particles. If physicists measure a particle’s position, they cannot also measure its momentum, so the theory goes. But a new experiment has managed to circumvent this rule—the so-called uncertainty principle—by ascertaining just a little bit about a particle’s position, thus retaining the ability to measure its momentum, too.

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Mapping the optimal route between two quantum states

Mapping the optimal route between two quantum states

July 30, 2014

As a quantum state collapses, it will follow a path known as a quantum trajectory. In a new paper featured this week on the cover of Nature, scientists have shown that it is possible to track these quantum trajectories and compare them to a theory, recently developed by University of Rochester physicists, for predicting the most likely path a system will take.

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“Compressive sensing” provides new approach to measuring a quantum system

“Compressive sensing” provides new approach to measuring a quantum system

June 27, 2014

Physicists have shown that a technique called compressive sensing offers a way to measure both variables at the same time, without violating the Uncertainty Principle.

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