Multi-qubit Rydberg gates between distant atoms

• URL: http://arxiv.org/abs/2507.16602v1
• Date: Tue, 22 Jul 2025 13:58:39 GMT
• Title: Multi-qubit Rydberg gates between distant atoms
• Authors: Antonis Delakouras, Georgios Doultsinos, David Petrosyan,
• Abstract summary: We propose an efficient protocol to realize multi-qubit gates in arrays of neutral atoms.<n>We apply a global laser pulse to transfer the atoms to a Rydberg state with strong blockade interaction.<n>The number of Rydberg excitations, and thereby the parity of the resulting state, depends on the multiqubit input state.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We propose an efficient protocol to realize multi-qubit gates in arrays of neutral atoms. The atoms encode qubits in the long-lived hyperfine sublevels of the ground electronic state. To realize the gate, we apply a global laser pulse to transfer the atoms to a Rydberg state with strong blockade interaction that suppresses simultaneous excitation of neighboring atoms arranged in a star-graph configuration. The number of Rydberg excitations, and thereby the parity of the resulting state, depends on the multiqubit input state. Upon changing the sign of the interaction and de-exciting the atoms with an identical laser pulse, the system acquires a geometric phase that depends only on the parity of the excited state, while the dynamical phase is completely canceled. Using single qubit rotations, this transformation can be converted to the C$_k$Z or C$_k$NOT quantum gate for $k+1$ atoms. We also present extensions of the scheme to implement quantum gates between distant atomic qubits connected by a quantum bus consisting of a chain of atoms.

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