How fast is quantum entanglement? Scientists investigate it at attosecond scale

Re:How fast is quantum entanglement? Scientists investigate ... by cosignal on Tuesday October 22, 2024 @10:20PM (#41921115)

I know next to nothing about physics, but isn't the "It just so happens" part of what you said potentially misleading? Isn't it that light is massless, so that directly implies that it would travel at the maximum speed?

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Re:How fast is quantum entanglement? Scientists investigate ... by cyberax on Tuesday October 22, 2024 @11:55PM (#41921662)

It's a distinction with no difference. Only massless particles can move at the "maximum speed", in our Universe these are photons and gluons. And maybe gravitons, if they exist.

Similarly, massless particles can't move below the "maximum speed", as they'll have no energy or momentum and won't be able to interact with anything.

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Re:How fast is quantum entanglement? Scientists investigate ... by MattPalmer1086 on Wednesday October 23, 2024 @03:29AM (#41922688)

Why would the absence of mass force something to travel at the maximum speed? I could understand it being able to travel at that speed; why would it always do so though?

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Re:How fast is quantum entanglement? Scientists investigate ... by cyberax on Wednesday October 23, 2024 @12:05PM (#41926414)

Theoretically, a massless particle can move slower than light. But then it'll have zero energy and momentum, so it won't be able to interact with anything.

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Re:How fast is quantum entanglement? Scientists investigate ... by MattPalmer1086 on Wednesday October 23, 2024 @04:49PM (#41929144)

Thanks. The equations give the answer in the end, I found this explanation the best [1].

The only way to get a zero mass is if the energy is zero, or the velocity is c.

[1] https://profoundphysics.com/why-do-photons-have-no-mass-simp...

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