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Separable States can be used to distribute entanglement
T S Cubitt1, F Verstraete, W Dür
1Max Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany.
Physical Review Letters
|August 9, 2003
Summary
Entanglement can be distributed without prior entanglement between particles. A third particle, never entangled itself, can entangle two distant particles, challenging traditional quantum distribution methods.
Area of Science:
- Quantum mechanics
- Quantum information science
- Quantum entanglement
Background:
- Quantum entanglement is a fundamental phenomenon where particles remain connected regardless of distance.
- Current methods for distributing entanglement often rely on pre-entangled states.
Purpose of the Study:
- To demonstrate novel methods for distributing quantum entanglement.
- To explore entanglement generation without direct entanglement of mediating particles.
Main Methods:
- Theoretical analysis of quantum state interactions.
- Investigating the role of mediating particles in entanglement distribution.
- Exploring properties of completely positive maps.
Main Results:
- Demonstrated that entanglement distribution is possible without pre-existing entanglement.
- Showed that a non-entangled third particle can entangle distant particles.
- Illustrated entanglement generation via interaction with a mixed mediating particle.
- Identified that compositions of separable quantum maps can create entanglement.
Conclusions:
- Entanglement distribution can be achieved through indirect means, decoupling the mediator from the entangled system.
- This research opens new avenues for quantum communication and computation protocols.