Quantum Information Processing ( IF 2.2 ) Pub Date : 2020-06-19 , DOI: 10.1007/s11128-020-02715-4 Yu Zhang , Tong Liu , Yang Yu , Chui-Ping Yang
Cat-state qubits (qubits encoded with cat states) have recently attracted much attention because of their enhanced lifetimes with quantum error correction. We here consider a circuit QED system consisting of three superconducting qutrits, each coupled to an individual cavity but all coupled to a common cavity. We show that entangled W states of three cat-state qubits hosted by the three individual cavities can be prepared with only a few basic operations. The higher energy level of the qutrits is not occupied; thus, decoherence from this level of the qutrits is greatly suppressed. In addition, the W states can be prepared deterministically. Numerical simulations show that high-fidelity production of the W states of three cat-state qubits is feasible with current circuit QED technology. This proposal is quite general and can be applied to create the proposed W states, with each cavity being a microwave or optical cavity and each qutrit being a three-level natural or artificial atom.
中文翻译:
电路QED中猫态量子位纠缠W态的制备
猫态量子位(用猫态编码的量子位)由于具有延长的量子误差校正寿命而最近备受关注。我们在这里考虑一个电路QED系统,该系统由三个超导量子态组成,每个量子态耦合到一个单独的腔体,但全部耦合到一个公共腔体。我们表明,由三个单独的腔体托管的三个猫态量子位的纠缠W态仅需几个基本操作即可准备。量子态的较高能级未被占用;因此,极大地抑制了来自该量子态水平的退相干。另外,可以确定地准备W状态。数值模拟表明,高保真度生产的W使用当前电路QED技术,三个猫状态量子位的状态是可行的。该提议非常笼统,可用于创建提议的W态,每个腔是微波或光学腔,每个量子态是三级天然或人造原子。