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In the macroscopic world, time is intrinsically asymmetric, flowing in a specific direction, from past to future. However, the same is not necessarily true for quantum systems, as some quantum processes produce valid quantum evolutions under time reversal. Supposing that such processes can be probed in both time directions, we can also consider quantum processes probed in a coherent superposition of forwards and…

In this short note, we explore thinking of the traditional idea of "distributed representations" as two distinct phenomena: "composition" and "superposition". We walk through toy examples from Thorpe (1989), discussing them from this lens.

Researchers have used atoms trapped by light to sustain quantum superposition. The cat is both dead and alive.

Trying to use an account I created a long time ago. Logging in with the old password fails. Attempts to reset the password using my email produce "Sorry we could not find your account". Meanwhile an attempt to create a new account with my email produces "Email has already been taken". Comments URL: https://news.ycombinator.com/item?id=32419601 Points: 1 # Comments: 0

Quantum superposition is a phenomenon in which a tiny particle can be in two states at the same time — but only if it is not being directly observed.

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Researchers have put a sapphire crystal containing quadrillions of atoms into a superposition of quantum states, bringing quantum effects into the macroscopic world

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Even if you are not a quantum physicist, you will most likely have heard of Schrödinger's famous cat. Erwin Schrödinger came up with the feline that can be alive and dead at the same time in a thought experiment in 1935. The obvious contradiction—after all, in everyday life we only ever see cats that are either alive or dead—has prompted scientists to try to realize analogous situations in the laboratory. So far,…

Quantum physics can often make an object behave in seemingly impossible ways, Now scientists have used quantum physics to create a battery capable of "superabsorption," meaning it absorbs energy more quickly the bigger it gets.

University of Queensland theoretical physicist Joshua Foo and his colleagues ran calculations that revealed surprising black hole quantum phenomena.

Many quantum sensors experience high levels of noise during measurements that severely degrade their performance. Now a new study reveals a technique for overcoming this noise to potentially boost the sensitivity of these devices up to a hundredfold.

Physicists at the University of Innsbruck have succeeded in creating hot Schrödinger cat states in a superconducting microwave resonator.

A new study finds that machine learning (ML)—which now powers computer vision and speech recognition—can also prove significantly better than regular computers at the tasks at which quantum computers excel. ML will thus help tackle key quantum problems in the era before quantum computers arrive.

Can we program a quantum computer to output the text 'Hello World'? This tutorial walks through the steps to write a quantum computing program that implements Grover's Search algorithm and a custom or

Recent advances point the way to useful classical-quantum hybrids

Physicists have put the largest-ever object into a quantum superposition

Quantum information theory is the field behind quantum computing, but experts in this field are also applying their way of thinking to some big questions in ...