‘Virtual’ interferometers may overcome scale issues for optical quantum computers

Researchers have devised an entirely new way of implementing large-scale interferometers that will dramatically miniaturize optical processing circuitry.

Read More...

Comments Off on ‘Virtual’ interferometers may overcome scale issues for optical quantum computers

Basic plasma wave physics reshaped by NASA observations

NASA scientists are reshaping the basic understanding of a type of wave in space known as a kinetic Alfvén wave.

Read More...

Comments Off on Basic plasma wave physics reshaped by NASA observations

Experimental multipartite entanglement and randomness certification of the W state in the quantum steering scenario

Recently, Cavalcanti et al (2015) proposed a method to certify the presence of entanglement in asymmetric networks, where some users do not have control over the measurements they are performing. Such asymmetry naturally emerges in realistic situations, such as in cryptographic protocols over quantum networks. Here we implement such ‘semi-device-independent’ techniques to experimentally witness all types of entanglement on a three-qubit photonic W state. Furthermore, we analyse the amount of genuine randomness that can be certified in this scenario from any bipartition of the three-qubit W state. …

Read More...

Comments Off on Experimental multipartite entanglement and randomness certification of the W state in the quantum steering scenario

Physicists move closer to listening in on sub-atomic conversation

Much like two friendly neighbors getting together to chat over a cup of coffee, the minuscule particles in our sub-atomic world also come together to engage in a kind of conversation. Now, nuclear scientists are developing tools to allow them to listen in on the particles’ gab fests and learn more about how they stick together to build our visible universe. The first complex calculations of a particle called the sigma have now been carried out.

Read More...

Comments Off on Physicists move closer to listening in on sub-atomic conversation

Quantum Questions Inspire New Math

In order to fully understand the quantum world, we may have to develop a new realm of mathematics. …

Read More...

Comments Off on Quantum Questions Inspire New Math

Quantum communication: How to outwit noise

Quantum information transfer requires reliable information transfer from one quantum system to the other, which is extremely difficult to achieve. Independently, two research teams have now developed a new quantum communication protocol. This protocol enables reliable quantum communication even under the presence of contaminating noise. Both research groups work with the same basic concept: To make the protocol immune to the noise, they add an additional element, a so-called quantum oscillator, at both ends of the quantum channel.

Read More...

Comments Off on Quantum communication: How to outwit noise

Ion pairs perform enhanced ‘spooky action,’ physicists show

Adding to strong recent demonstrations that particles of light perform what Einstein called ‘spooky action at a distance,’ in which two separated objects can have a connection that exceeds everyday experience, physicists have confirmed that particles of matter can act really spooky too.

Read More...

Comments Off on Ion pairs perform enhanced ‘spooky action,’ physicists show

A Long-Sought Proof, Found and Almost Lost

When a German retiree proved a famous long-standing mathematical conjecture, the response was underwhelming. …

Read More...

Comments Off on A Long-Sought Proof, Found and Almost Lost