This article presents a new approach for fast operation over multi-qubits using quantum-interference. Our proposal goes beyond the circuit-model paradigm of quantum computing, where algorithms are implemented as sequences of one- and two-qubit gates. The circuit model puts clear requirements on candidate physical systems for #quantumcomputing and it allows a system independent compilation of any algorithm in terms of gate operations. Here we use a type of many-body interaction, available in many candidate systems for quantum computing, for direct and efficient implementation of multi-qubit gates. This would reduce the number of operations and errors incurred during the execution of a given algorithm. We analyze the implementation of the scheme in a laser-excited atomic system. Remarkably, the engineered quantum interference in this system eliminates mechanical force between strongly interacting excited atoms reducing associated operation errors. We further show that the central idea of a fast #multiQubitGate could be implemented also in other systems, such as #SuperconductingCircuits. Our work suggests that this is a good time to open Pandora’s box and supplement the circuit-model paradigm with physically motivated multi-qubit gates.

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M. Khazali, Klaus Mølmer, “Fast multi-qubit gates via adiabatic evolution in dark state manifolds of Rydberg atoms and superconducting circuits”, Phys. Rev. X 10, 021054 (2020).