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Realization of quantum gates with multiple control qubits or multiple target qubits in a cavity

Zeitschrift:: Quantum Information Processing > Ausgabe 6/2015

Autoren:: Muhammad Waseem, Muhammad Irfan, Shahid Qamar

Abstract

We propose a scheme to realize a three-qubit controlled phase gate and a multi-qubit controlled NOT gate of one qubit simultaneously controlling n-target qubits with a four-level quantum system in a cavity. The implementation time for multi-qubit controlled NOT gate is independent of the number of qubit. Three-qubit phase gate is generalized to n-qubit phase gate with multiple control qubits. The number of steps reduces linearly as compared to conventional gate decomposition method. Our scheme can be applied to various types of physical systems such as superconducting qubits coupled to a resonator and trapped atoms in a cavity. Our scheme does not require adjustment of level spacing during the gate implementation. We also show the implementation of Deutsch–Joza algorithm. Finally, we discuss the imperfections due to cavity decay and the possibility of physical implementation of our scheme.

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Titel: Realization of quantum gates with multiple control qubits or multiple target qubits in a cavity
Autoren:: Muhammad Waseem
Muhammad Irfan
Shahid Qamar
Publikationsdatum: 01.06.2015
DOI: https://doi.org/10.1007/s11128-015-0947-7
Verlag: Springer US
Zeitschrift: Quantum Information Processing
Ausgabe 6/2015
Print ISSN: 1570-0755
Elektronische ISSN: 1573-1332

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