One-step implementation of a multiqubit phase gate with one control qubit and multiple target qubits in coupled...

Area of Science:

• Quantum Information Science
• Atomic Physics
• Quantum Optics

Background:

• Scalable quantum computing requires efficient multi-qubit gates.
• Controlling multiple qubits simultaneously is a key challenge.
• Cavity quantum electrodynamics offers a promising platform for quantum information processing.

Purpose of the Study:

• To propose a novel one-step scheme for implementing a multiqubit controlled phase gate.
• To achieve simultaneous control of multiple target qubits by a single control qubit.
• To enhance robustness against decoherence in quantum computing networks.

Main Methods:

• Utilizing three-level atoms in coupled cavity arrays.
• Implementing selective qubit-qubit couplings via adiabatic elimination of atomic and photonic states.
• Employing external fields to engineer desired phase shifts between qubits.

Main Results:

• A one-step scheme for a multiqubit controlled phase gate was successfully proposed.
• Selective couplings were achieved, enabling simultaneous control.
• The proposed model demonstrates robustness against decoherence as no excitations occur during operation.

Conclusions:

• The developed scheme provides a robust method for multiqubit gates.
• This work is a significant step towards building scalable quantum computing networks.
• The technique leverages atomic and photonic states in cavity arrays for efficient quantum operations.