Volume 127, Number 5, September 2019
|Number of page(s)||7|
|Published online||10 October 2019|
Constructing multi-target controlled phase gate in circuit QED and its applications
1 Department of Physics, Harbin Institute of Technology - Harbin 150001, China
2 Department of Physics, Fuzhou University - Fuzhou 350002, China
Received: 23 May 2019
Accepted: 25 August 2019
We present a one-step scheme in circuit quantum electrodynamics (QED) to realize multi-target controlled phase gates by using one microwave cavity that is coupled capacitively to a superconducting flux qutrit which plays the control role and simultaneously controls n target qutrits embedded in the microwave cavity. A strong classical field is imposed on the control qutrit so as to yield two dressed states, one of which is coded as a logical state. The controlled phase gates can be employed to achieve the creation of entangled states deterministically without any measurement, including the Bell state, the GHZ state, and the cluster state. Numerical simulations demonstrate that the high-fidelity creation of the entangled state is feasible with the constructed controlled phase gate under the present circuit QED technology.
PACS: 03.67.Lx – Quantum computation architectures and implementations / 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 03.67.Mn – Entanglement measures, witnesses, and other characterizations
© EPLA, 2019
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