Parity-dependent state transfer for direct entanglement generation

Abstract

As quantum information technologies advance, challenges in scaling and connectivity persist, particularly the need for long-range qubit connectivity and efficient entanglement generation. Perfect State Transfer enables time-optimal state transfer between distant qubits using only nearest-neighbor couplings, enhancing device connectivity. Moreover, the transfer protocol results in effective parity-dependent non-local interactions, extending its utility to entanglement generation. Here, we experimentally demonstrate Perfect State Transfer and multi-qubit entanglement generation on a chain of six superconducting transmon qubits with tunable couplers, controlled via parametric drives. By simultaneously activating and engineering all couplings, we implement the transfer for up to six qubits, verifying single-excitation dynamics for different initial states. Extending the protocol to multiple excitations, we confirm its parity-dependent nature, where excitation number controls the phase of the transferred state. Finally, leveraging this property, we prepare a Greenberger-Horne-Zeilinger state using a single transfer operation, showcasing the potential of Perfect State Transfer for efficient entanglement generation.

18 pages, 11 figures

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Cited by in corpus (5)

• Parametric multi-element coupling architecture for coherent and dissipative control of superconducting qubits
• Fast and efficient long-distance quantum state transfer in long-range spin-$\frac{1}{2}$ models
• Synthetic fractional flux quanta in a ring of superconducting qubits
• Perfect Wave Transfer in Continuous Quantum Systems
• Remote entanglement generation via enhanced quantum state transfer