Entanglement Between Photons that have Never Coexisted
E. Megidish, A. Halevy, T. Shacham, T. Dvir, L. Dovrat, H. S. Eisenberg
(Submitted on 19 Sep 2012)
The role of the timing and order of quantum measurements is not just a fundamental question of quantum mechanics, but also a puzzling one. Any part of a quantum system that has finished evolving, can be measured immediately or saved for later, without affecting the final results, regardless of the continued evolution of the rest of the system. In addition, the non-locality of quantum mechanics, as manifested by entanglement, does not apply only to particles with spatial separation, but also with temporal separation. Here we demonstrate these principles by generating and fully characterizing an entangled pair of photons that never coexisted. Using entanglement swapping between two temporally separated photon pairs we entangle one photon from the first pair with another photon from the second pair. The first photon was detected even before the other was created. The observed quantum correlations manifest the non-locality of quantum mechanics in spacetime.
Sunday, September 30, 2012
Wednesday, August 29, 2012
A quick scan of five years of high frequency trading...
Nanex: The Rise of the HFT Machines
Soon to be clocking in at an all-time high speed via micro-wave relays...
ZeroHedge: From Chicago To New York And Back In 8.5 Milliseconds
And utilizing the drone industry to cross the pond...
Wired: Raging Bulls - How Wall Street Got Addicted to Light-Speed Trading
“They’re doing amazing things now with drones,” Dziejma said.
“Drones?”
Sure, he said. A fleet of unmanned, solar-powered drones carrying microwave relay stations could hover at intervals across the Atlantic.
And with these developments, new opportunities for insider traders...
Science News: Quantum teleportation leaps forward
Nanex: The Rise of the HFT Machines
Soon to be clocking in at an all-time high speed via micro-wave relays...
ZeroHedge: From Chicago To New York And Back In 8.5 Milliseconds
And utilizing the drone industry to cross the pond...
Wired: Raging Bulls - How Wall Street Got Addicted to Light-Speed Trading
“They’re doing amazing things now with drones,” Dziejma said.
“Drones?”
Sure, he said. A fleet of unmanned, solar-powered drones carrying microwave relay stations could hover at intervals across the Atlantic.
And with these developments, new opportunities for insider traders...
Science News: Quantum teleportation leaps forward
Friday, July 20, 2012
Global Intermittent Synchronization
Physical Review E: Transition to complete synchronization and global intermittent synchronization in an array of time-delay systems - R. Suresh et al.
Thursday, April 19, 2012
Tuesday, March 27, 2012
Tuesday, July 19, 2011
110 nanoseconds of oblivion
Demonstration of temporal cloaking
Authors: Moti Fridman, Alessandro Farsi, Yoshitomo Okawachi, Alexander L. Gaeta
(Submitted on 11 Jul 2011)
Abstract: Recent research has uncovered a remarkable ability to manipulate and control electromagnetic fields to produce effects such as perfect imaging and spatial cloaking. To achieve spatial cloaking, the index of refraction is manipulated to flow light from a probe around an object in such a way that a "hole" in space is created, and it remains hidden. Alternatively, it may be desirable to cloak the occurrence of an event over a finite time period, and the idea of temporal cloaking was proposed in which the dispersion of the material is manipulated in time to produce a "time hole" in the probe beam to hide the occurrence of the event from the observer. This approach is based on accelerating and slowing down the front and rear parts, respectively, of the probe beam to create a well controlled temporal gap in which the event occurs so the probe beam is not modified in any way by the event. The probe beam is then restored to its original form by the reverse manipulation of the dispersion. Here we present an experimental demonstration of temporal cloaking by applying concepts from the time-space duality between diffraction and dispersive broadening. We characterize the performance of our temporal cloak by detecting the spectral modification of a probe beam due to an optical interaction while the cloak is turned off and on and show that the event is observed when the cloak is turned off but becomes undetectable when the cloak is turned on. These results are a significant step toward the development of full spatio-temporal cloaking.
More here:
First Demonstration of Time Cloaking
Physicists have created a "hole in time" using the temporal equivalent of an invisibility cloak
The device has some limitations. The Cornell time cloak lasts only for 110 nanoseconds--that's not long. And Fridman and co say the best it can achieve will be 120 microseconds.
Authors: Moti Fridman, Alessandro Farsi, Yoshitomo Okawachi, Alexander L. Gaeta
(Submitted on 11 Jul 2011)
Abstract: Recent research has uncovered a remarkable ability to manipulate and control electromagnetic fields to produce effects such as perfect imaging and spatial cloaking. To achieve spatial cloaking, the index of refraction is manipulated to flow light from a probe around an object in such a way that a "hole" in space is created, and it remains hidden. Alternatively, it may be desirable to cloak the occurrence of an event over a finite time period, and the idea of temporal cloaking was proposed in which the dispersion of the material is manipulated in time to produce a "time hole" in the probe beam to hide the occurrence of the event from the observer. This approach is based on accelerating and slowing down the front and rear parts, respectively, of the probe beam to create a well controlled temporal gap in which the event occurs so the probe beam is not modified in any way by the event. The probe beam is then restored to its original form by the reverse manipulation of the dispersion. Here we present an experimental demonstration of temporal cloaking by applying concepts from the time-space duality between diffraction and dispersive broadening. We characterize the performance of our temporal cloak by detecting the spectral modification of a probe beam due to an optical interaction while the cloak is turned off and on and show that the event is observed when the cloak is turned off but becomes undetectable when the cloak is turned on. These results are a significant step toward the development of full spatio-temporal cloaking.
More here:
First Demonstration of Time Cloaking
Physicists have created a "hole in time" using the temporal equivalent of an invisibility cloak
The device has some limitations. The Cornell time cloak lasts only for 110 nanoseconds--that's not long. And Fridman and co say the best it can achieve will be 120 microseconds.
Sunday, July 18, 2010
The Highest Freq Known to Man
... is in the attosecond range.
Firing away 180 attosecond pulses, the Max-Planck-Institut für Quantenoptik has measured the interval between a photon striking an atom and the emission of an electron. And so the record stands: 20 attosecondes.
Verzögerter Zeitpunkt Null
Firing away 180 attosecond pulses, the Max-Planck-Institut für Quantenoptik has measured the interval between a photon striking an atom and the emission of an electron. And so the record stands: 20 attosecondes.
Verzögerter Zeitpunkt Null
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