Parity-dependent state transfer for direct entanglement generation
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 potential of Perfect State Transfer for efficient entanglement generation.
Authors
- Klaus Liegener (ORCID: https://orcid.org/0000-0001-7165-734X)
- Max Werninghaus (ORCID: https://orcid.org/0000-0002-6011-9498)
- Gleb Krylov (ORCID: https://orcid.org/0000-0002-3022-0368)
- Franz X. Haslbeck (ORCID: https://orcid.org/0000-0002-5246-753X)
- Stefan Filipp (ORCID: https://orcid.org/0000-0002-1976-1817)
- Lasse Södergren (ORCID: https://orcid.org/0000-0001-5208-8209)
- F. Wallner (ORCID: https://orcid.org/0000-0002-7533-4692)
- Ivan Tsitsilin (ORCID: https://orcid.org/0000-0002-9054-3695)
- Niklas J. Glaser (ORCID: https://orcid.org/0000-0001-6896-4453)
- L. Richard (ORCID: https://orcid.org/0009-0005-8363-9225)
- Meenakshi Singh (ORCID: https://orcid.org/0000-0002-1165-5892)
- Federico Roy (ORCID: https://orcid.org/0000-0002-9259-3100)
- Gerhard B. P. Huber (ORCID: https://orcid.org/0000-0001-5034-634X)
- Frank Pfeiffer (ORCID: https://orcid.org/0000-0001-9215-4362)
- L. Koch (ORCID: https://orcid.org/0000-0002-5078-7513)
- João H. Romeiro (ORCID: https://orcid.org/0000-0003-1288-1186)
- C. Schweizer (ORCID: https://orcid.org/0000-0002-4565-947X)
- Achim Marx (ORCID: https://orcid.org/0000-0002-5886-6742)
- C. M. F. Schneider (ORCID: https://orcid.org/0000-0002-5766-7979)
- Johannes Schirk (ORCID: https://orcid.org/0009-0008-5872-7962)
- N. Bruckmoser (ORCID: https://orcid.org/0009-0004-8957-893X)
- D. Bunch
Institutions
- Bavarian Academy of Sciences and Humanities (DE)
- Munich Center for Quantum Science and Technology (DE)
- Technical University of Munich (DE)
- Ludwig-Maximilians-Universität München (DE)
- Saarland University (DE)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-03-18
- DOI
- https://doi.org/10.1038/s41467-025-57818-2
- Citations
- 7
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 17.37
Funders
- Deutsche Forschungsgemeinschaft
- Bundesministerium für Bildung und Forschung
- Horizon 2020 Framework Programme