Physicists Achieve Quantum Teleportation of Photon Over 25 Kilometers | IFLScience

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  1. Tomi Engdahl says:

    Quantum Experiment Shows How Time ‘Emerges’ from Entanglement

    Time is an emergent phenomenon that is a side effect of quantum entanglement, say physicists. And they have the first experimental results to prove it

  2. Tomi Engdahl says:

    First Teleportation of Multiple Quantum Properties of a Single Photon

    Photons have many properties such as their frequency, momentum, spin and orbital angular momentum. But when it comes to quantum teleportation, physicists have only ever been able to to transmit one of these properties at a time. So the possibility of teleporting a complete quantum object has always seemed a distant dream. Now a team of Chinese physicists has worked out how to teleport more than one quantum property.

    First Teleportation Of Multiple Quantum Properties Of A Single Photon
    To truly teleport an object, you have to include all its quantum properties. Now physicists have worked out how

    Back in 1997, physicists performed an extraordinary experiment
    A more precise description of the team’s experiment with photons is that they transferred the quantum information that describes the polarisation state of one photon to another photon.

    Since then, this kind of teleportation has become routine in quantum optics labs all over the world but always with the same limitation. All these experiments involve the transfer of a single quantum property.

    Until now. Today, Xi-Lin Wang and buddies at the University of Science and Technology of China in Hefei say they have done just that. The team have worked out how to teleport two quantum properties of a single photon to another photon at the same time — the first time this has ever been done. The work is an important stepping stone towards the ultimate goal of teleporting complex objects such as atoms and small molecules in their entirety.

    Most standard teleportation experiments focus on the teleportation of a photon’s polarisation, which is oriented either vertically or horizontally and so is easy to measure. A more complex form of polarisation occurs when the polarisation rotates about the beam axis as the photon propagates.

    This is known as circular polarisation and as a result, the photon has a kind of angular momentum known as spin angular momentum that can also be teleported.

  3. Tomi Engdahl says:

    Photons link arms on chip to hasten march of quantum crypto
    Cheap, fast, entangled photons for fun and profit

    A multinational collaboration of boffins reckons it’s come up with a chippable solution to one of the practical problems of quantum communications: getting a good source of entangled photons.

    While commercial quantum key distribution (QKD) devices already exist, getting as much of the process onto silicon is the foundation of making such services widespread and affordable.

    To be published in The Optical Society’s (OSA’s) journal Optica, the paper – also available as an Arxiv pre-print here – describes the use of a micro-ring resonator as a continuous on-chip source of bright, entangled photons.

    As the researchers note while the micro-ring resonator is an efficient source of photon pairs, “entangled state emissions have never been demonstrated”.

  4. Tomi Engdahl says:

    Another Step In Quantum Computing: A Functional Interconnect

    According to a recent article in the MIT Technology Review, a team of international physicists have been able to create a quantum computing interconnect. The interconnect, which is used to connect separate silicon photonic chips, has the important feature of preserving entanglement. This marks a vital step in creating quantum computers that don’t have to work in isolation.

    Physicists Unveil First Quantum Interconnect

    An international team of physicists has found a way to connect quantum devices in a way that transports entanglement between them.


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