Rydberg quantum controlled-phase gate with one control and multiple target qubits

Muhammad Waseem, Muhammad Irfan, Shahid Qamar

Yucheng He, J.M. Liu, F.-Q. Guo +5 more

Cai-Peng Shen, Jin-Lei Wu, Shi-Lei Su +1 more

One scheme is presented to construct the robust multi-qubit arbitrary-phase controlled-phase gate (CPG) with one control and multiple target qubits in Rydberg atoms using the Lewis-Riesenfeld (LR) invariant method. The scheme is not limited by adiabatic condition while preserves the robustness against control parameter variations of adiabatic evolution. Comparing with the adiabatic case, our scheme does not require very strong Rydberg interaction strength. Taking the construction of two-qubit π CPG as an example, our scheme is more robust against control parameter variations than non-adiabatic scheme and faster than adiabatic scheme.

Tong Liu, Bao-qing Guo, Yang Zhang +2 more

Hong‐Fu Wang, Ai‐Dong Zhu, Shou Zhang

We propose a one-step scheme to implement a multiqubit controlled phase gate with one qubit simultaneously controlling multiple qubits with three-level atoms at distant nodes in coupled cavity arrays. Selective qubit-qubit couplings are achieved by adiabatically eliminating the atomic excited states and photonic states, and the required phase shifts between the control qubit and any target qubit can be realized through suitable choices of the parameters of the external fields. Moreover, the effective model is robust against decoherence because neither the atoms nor the field modes are excited during the gate operation, leading to a useful step toward scalable quantum computing networks.

Mohammadsadegh Khazali, Khabat Heshami, Christoph Simon