环形耦合传输线谐振器阵列中磁通量子比特多粒子纠缠态的快速产生
Fast generation of multiparticle entangled state for flux qubits in a circle array of transmission line resonators with tunable coupling
摘要：
研究了在超导磁通量子比特的电路QED系统中快速产生Greenberger-Horne-Zeilinger（GHZ）态的一步方法。GHZ态的产生时间约为10 ns，比磁通量子比特的相干时间短得多，与单量子比特的相干时间相当。在我们的建议中，一个随时间变化的微波场被施加到超导传输线谐振器（TLR），并以受控的方式移动谐振器，从而诱导间接的量子比特-量子比特耦合，而没有量子比特和谐振器之间的残余纠缠。可调谐耦合TLR圆阵列的设计为我们提供了扩展这种一步方案的情况下，许多量子位耦合通过几个TLR的潜力。
英文摘要：
We study a one-step approach to the fast generation of Greenberger-Horne-Zeilinger (GHZ) states in a circuit QED system with superconducting flux qubits. The GHZ state can be generated in about 10 ns, which is much shorter than the coherence time of flux qubits and comparable with the time of single-qubit operation. In our proposal, a time-dependent microwave field is applied to a superconducting transmission line resonator (TLR) and displaces the resonator in a controlled manner, thus inducing indirect qubit-qubit coupling without residual entanglement between the qubits and the resonator. The design of a tunably coupled TLR circle array provides us with the potential for extending this one-step scheme to the case of many qubits coupled via several TLRs.
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