In the quantum world, the future affects the past: Hindsight and foresight together more accurately ‘predict’ a quantum system’s state

Date: February 9, 2015 In the quantum world, the future predicts the past. Playing a guessing game with a superconducting circuit called a qubit, a physicist has discovered a way to narrow the odds of correctly guessing the state of a two-state system. By combining information about the qubit’s evolution after a target time with information…

Quantum ‘sealed envelope’ system enables ‘perfectly secure’ information storage

Contact: Adrian Kent apak@damtp.cam.ac.uk 44-122-376-0379 University of Cambridge A breakthrough in quantum cryptography demonstrates that information can be encrypted and then decrypted with complete security using the combined power of quantum theory and relativity – allowing the sender to dictate the unveiling of coded information without any possibility of intrusion or manipulation. Scientists sent encrypted…

Scientists prove Heisenberg’s intuition correct : Coded messages are disturbed by the Eavesdropper ;-)

Contact: Caron Lett caron.lett@york.ac.uk 44-019-043-22029 University of York An international team of scientists has provided proof of a key feature of quantum physics – Heisenberg’s error-disturbance relation – more than 80 years after it was first suggested. One of the basic concepts in the world of quantum mechanics is that it is impossible to observe…

Quantum effects get a weirdness scale

  25 April 2013 by Jacob Aron Magazine issue 2914.  Subscribe and save For similar stories, visit the Quantum World Topic Guide SCHRÖDINGER’S cat, both dead and alive at once, was always meant to be a thought experiment, but will ordinary objects or your favourite feline ever enter the quantum world? No one knows, but…

Researchers explore quantum entanglement: superluminal

Contact: Leanne Yohemas lmyohema@ucalgary.ca 402-220-7722 University of Calgary Paper in Physical Review Letters delves into phenomenon Einstein called ‘spooky’ Albert Einstein called quantum entanglement—two particles in different locations, even on other sides of the universe, influencing each other—”spooky action at a distance.” Einstein made the comment while criticizing quantum mechanics as incomplete—the phenomenon of quantum…

Faster-than-light communication, the hidden influence of inequality and the possibility of infinite speed

Contact: Jenny Hogan jenny.hogan@quantumlah.org 65-651-64302 Centre for Quantum Technologies at the National University of Singapore Researchers look beyond space and time to cope with quantum theory IMAGE: Trying to explain quantum “spooky action at a distance” using any kind of signal pits Einstein’s relativity against our concept of a smooth spacetime.Click here for more information.…