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zanazzi78
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What are Quantum Entangled Photons and how are they produced?
Noticed this comment in the first referenced link given. Is this part of how they get single pairs of photons for this experiment? For the experiment to be useful we of course cannot have more then one photon being split in two at a time for the experiment to work. I’ve always wondered how they get a laser (made to generate lots of light) to “slow down” to sending photons slow enough to be considered “one at time”. Is it because of the odds of 1 in 1000000, that the subject photons coming out of the BBO are separated in time enough that no two pair come close enough in time to interfere with the testing?“One out of 106 ultraviolet photons converts into two photons”
zanazzi78 said:Cheers Edgardo for the links that really was a big help. It does however raises the question of what's happening inside the crystal to 'split' the original photon into two entangled photons ... hmmmmm ... i think i need to find out more about these non-linear crystals.
zanazzi78 said:What are Quantum Entangled Photons...
RandallB said:Noticed this comment in the first referenced link given. Is this part of how they get single pairs of photons for this experiment? For the experiment to be useful we of course cannot have more then one photon being split in two at a time for the experiment to work. I’ve always wondered how they get a laser (made to generate lots of light) to “slow down” to sending photons slow enough to be considered “one at time”. Is it because of the odds of 1 in 1000000, that the subject photons coming out of the BBO are separated in time enough that no two pair come close enough in time to interfere with the testing?
Or can they actually tune the “Pump Laser” to send out one proton a time. Such action is needed in double slit experiments to show individual photons, one at a time, can create the patterns of light and dark bands. I.e. - Without other photons getting involved in making the interference.
Does anyone know how “Pump Lasers” are set & verified to produce photons “one at a time” for experiments like these?
RandallB said:Noticed this comment in the first referenced link given. Is this part of how they get single pairs of photons for this experiment? For the experiment to be useful we of course cannot have more then one photon being split in two at a time for the experiment to work. I’ve always wondered how they get a laser (made to generate lots of light) to “slow down” to sending photons slow enough to be considered “one at time”. Is it because of the odds of 1 in 1000000, that the subject photons coming out of the BBO are separated in time enough that no two pair come close enough in time to interfere with the testing?
RandallB said:Or can they actually tune the “Pump Laser” to send out one proton a time. Such action is needed in double slit experiments to show individual photons, one at a time, can create the patterns of light and dark bands. I.e. - Without other photons getting involved in making the interference.
Does anyone know how “Pump Lasers” are set & verified to produce photons “one at a time” for experiments like these?
RandallB said:Thanks Edgardo just what I needed on how they do the experiments.
I also noticed an additional comment that the pairs of photons are all entangled regardless of where they show up in the cones.
But only those pairs that are inside the overlap of the cones are also in “superposition”.
In QM “entanglement” and “superposition” are the same thing aren’t they?
How can QM define superposition as different from entanglement?
RB
Quantum entangled photons are pairs of photons that are connected in a unique way, even when separated by large distances. This connection is known as entanglement, and it allows the photons to behave in a correlated manner, meaning that any change in one photon will result in a corresponding change in the other, regardless of the distance between them.
Quantum entangled photons are created through a process called spontaneous parametric down-conversion, in which a high-energy photon is split into two lower-energy photons. These two photons are then entangled, meaning that they share the same quantum state and are connected in a unique way.
Quantum entangled photons play a crucial role in quantum computing as they can be used to transmit information between quantum bits (qubits) in a secure and efficient manner. This allows for the development of powerful quantum computers that can solve complex problems much faster than classical computers.
Yes, quantum entangled photons have the potential to revolutionize communication as they can be used to transmit information with perfect security. This is because any attempt to intercept or measure the photons will result in a change in their quantum state, making it impossible for an eavesdropper to obtain the information without being detected.
Quantum entangled photons have many potential applications, including quantum communication, quantum cryptography, and quantum sensing. They can also be used in quantum metrology to improve the accuracy of measurements, and in quantum teleportation to transfer quantum information between two distant locations.