Quantum Physics

Loophole-free Bell test setup at TU DelftPart of the experimental setup for the Loophole-free Bell test at TU Delft, which provided the strongest proof yet of quantum entanglement. (Credit: Frank Auperle)

Albert Einstein once famously said, “God does not play dice.” He was talking about the quantum world, where the laws of everyday physics, and especially causality, break down. For example, subatomic particles linked together through a process called “entanglement” have no properties until they are measured, yet measuring one particle will instantaneously change the properties of the other, even if it is located on the other side of the universe. Einstein, who famously argued that nothing moves faster than light, thought that was impossible. He believed in a classical world where particles did have properties, and proposed that unknown “local forces” must cause both particles to change. Quantum physicists have been eroding that argument for decades, and recent experiments appear to have closed the case for local forces entirely. Yet much remains unknown about the mechanisms that make entanglement possible and what they say about the structure of our universe. Researchers are also trying to discover if entanglement occurs only in the quantum world, or whether they can entangle larger objects. Meanwhile, physicists took advantage of the quantum interactions of nanoscale wires to detect a Majorana fermion, a particle that is its own anti-particle, for the first time. Ultimately, scientists hope to harness these insights for quantum computing and Internet security, as well as fundamental discovery.

Q&A: Lieven Vandersypen, Quantum Nanoscientist

Artist impression of two electron spins that talk to each other via a 'quantum mediator'.
Apr 07, 2017

Physicist Lieven Vandersypen talks about his new role as co-director and the future of the Kavli Institute for Nanoscience at Delft University of Science and Technology.

Frontiers of Technology: Are Computers Finally Going Quantum?

The chip with the electrical contacts used to create the quantum dots. (Source: Tim Baart)
Apr 06, 2017

The race to build the world’s first quantum computer is heating up. A string of new investments from tech industry heavyweights like Microsoft, Intel and Google could finally create a winner. We asked three physicists—Lieven Vandersypen, Shohini Ghose and John Martinis—to estimate the odds.

Spotlight LIve: Hey Einstein, It Really Is a Quantum World (Transcript)

Dec 11, 2015

On November 5, Ronald Hanson and Renato Renner discussed the strongest proof yet that quantum theory, with faster-than-light links between entangled particles, explains the true nature of our universe. This is the transcript of their conversation.

Spotlight Live: Hey Einstein, It Really Is a Quantum World

Loop Hole-free Bell Test experiment
Oct 29, 2015

Ronald Hanson and Renato Renner discuss the strongest proof yet that quantum theory, with faster-than-light links between entangled particles, explains the true nature of our universe. 

The Future of Nanoscience: Three Kavli Nanoscience Institute Directors Forecast the Field’s Future

Jan 09, 2015

The directors of three Kavli nanoscience institutes – Paul Alivisatos, Paul McEuen, and Nai-Chang Yeh – discuss what makes the nanoscale so important, the field’s grand challenges, safety challenges, and their thoughts on funding, training and the future.

2014 Kavli Prize in Nanoscience: A Discussion with Thomas Ebbesen, Stefan Hell and Sir John Pendry

Sep 07, 2014

The winners of the 2014 Kavli Prize in Nanoscience – Thomas Ebbesen, Stefan Hell and Sir John Pendry – discuss breaking the limits of what we can do with light and opening the door to possibilities ranging from optical computing to invisibility cloaks.

The Next Life of Silicon

Apr 04, 2014

We live in the Age of Silicon, yet silicon microprocessors have begun to show signs of age, and for all its flexibility, silicon may be part of the problem. Is silicon up for the challenge, or are we entering a new age? We invited five experts to discuss the future of silicon.

Scaling Up: The Future of Nanoscience

Dec 16, 2010

In advance of the Kavli Futures Symposium, “Plenty of Room in the Middle: Nanoscience – The Next 50 Years,” four participants and extraordinary researchers -- David Awschalom, Angela Belcher, Don Eigler and Michael Roukes -- join in a roundtable discussion.


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