Quantum Teleportation Facts

Classical Mechanics Level 2

Which of the following is true of quantum teleportation?

1) Quantum information is transferred between states

2) The teleported particle is physically transferred between locations

3) A quantum state is cloned between observers

4) Quantum information is permanently removed from the system

1 only 1 and 2 1, 2, 3, and 4 1 and 4 1 and 3 1, 3, and 4 2 only

Matt DeCross by Matt DeCross , 27, USA

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1 solution

Matt DeCross
Apr 27, 2016

In quantum teleportation, no particle is physically transported between locations; indeed, this is the main utility of the phenomenon. Only the information encoding the quantum state is transferred, from a state in one location to another state elsewhere. At no time is the state cloned or deleted, however: this would violate the no-cloning and no-deletion theorems of quantum mechanics. The information is always preserved; it simply transfers from one location to another without replication.

11 Helpful 2 Interesting 2 Brilliant 0 Confused

In order to entangle A and B, is it not necessary for them to be in the same location? That would then require that they be physically transported from that common location to the locations of Alice and Bob in order to set up conditions for the quantum teleport to be achieved. Even though particle C is not physically transported, there appears to be some physical transport of compatible particles (A and/or B) before the quantum teleport can be achieved.

In fact, the problem of distributing entangled particles appears to be the main roadblock to deploying quantum teleportation to create a secure communication system: https://www.sciencealert.com/physicists-just-quantum-entangled-photons-between-earth-and-space

Robert Morewood - 3 years, 10 months ago

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The problem is referring to the actual "teleportation" itself, as opposed to the setup of the entangled particles to begin with. It's worth pointing out that the state that gets teleported isn't one of the originally entangled particles. I have reworded the answer choice to make it less ambiguous.

Matt DeCross - 3 years, 8 months ago

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