Generation and control of Greenberger-Horne-Zeilinger entanglement in superconducting circuits

Details Generation and control of Greenberger-Horne-Zeilinger entanglement in superconducting circuits Generation and control of Greenberger-Horne-Zeilinger entanglement in superconducting circuits

2005-10-21

arxiv.org/abs/quant-ph/0510169v3

Physical Review Letters, 96, 246803 (2006)

Physics

Quantum Physics

4 Pages with 1 figure. to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.246803

Going beyond the entanglement of microscopic objects (such as photons, spins, and ions), here we propose an efficient approach to produce and control the quantum entanglement of three macroscopic coupled superconducting qubits. By conditionally rotating, one by one, selected Josephson charge qubits, we show that their Greenberger-Horne-Zeilinger (GHZ) entangled states can be deterministically generated. The existence of GHZ correlations between these qubits could be experimentally demonstrated by effective single-qubit operations followed by high-fidelity single-shot readouts. The possibility of using the prepared GHZ correlations to test the macroscopic conflict between the noncommutativity of quantum mechanics and the commutativity of classical physics is also discussed.

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