Wei L F, Liu Yu-xi, Nori Franco
Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198, Japan.
Phys Rev Lett. 2006 Jun 23;96(24):246803. doi: 10.1103/PhysRevLett.96.246803. Epub 2006 Jun 21.
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.
超越微观物体（如光子、自旋和离子）的纠缠，我们在此提出一种有效方法来产生和控制三个宏观耦合超导量子比特的量子纠缠。通过有条件地逐个旋转选定的约瑟夫森电荷量子比特，我们表明可以确定性地生成它们的格林伯格-霍恩-泽林格（GHZ）纠缠态。这些量子比特之间GHZ关联的存在可以通过有效的单量子比特操作，随后进行高保真单次读出在实验上得到证明。还讨论了利用制备好的GHZ关联来测试量子力学的非对易性与经典物理学的对易性之间宏观冲突的可能性。
