AI Article Synopsis
- Entanglement swapping allows two particles to become entangled without any direct interaction, showcasing a unique feature of quantum mechanics.
- Recent experiments in a superconducting circuit achieved high-fidelity entanglement swapping, resulting in significant transfer of entanglement between qubits, indicated by a concurrence over 0.75.
- The study also demonstrated a concept called delayed-choice entanglement swapping, which shows that the entangled or separable nature of qubits can be determined by measurement choices made later, highlighting a new aspect of entanglement-separability duality.
Article Abstract
Entanglement swapping, the process to entangle two particles without coupling them in any way, is one of the most striking manifestations of the quantum-mechanical nonlocal characteristic. Besides fundamental interest, this process has applications in complex entanglement manipulation and quantum communication. Here we report a high-fidelity, unconditional entanglement swapping experiment in a superconducting circuit. The measured concurrence characterizing the qubit-qubit entanglement produced by swapping is above 0.75, confirming most of the entanglement of one qubit with its partner is deterministically transferred to another qubit that has never interacted with it. We further realize delayed-choice entanglement swapping, showing whether two qubits previously behaved as in an entangled state or as in a separable state is determined by a later choice of the type of measurement on their partners. This is the first demonstration of entanglement-separability duality in a deterministic way.
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