Spin-optomechanical cavity interfaces by deep subwavelength phonon-photon confinement
Abstract A central goal of quantum information science is transferring qubits between space, time, and modality. Spin-based systems in solids are promising quantum memories, but high-fidelity transfer of their quantum states to telecom optical fields remains challenging. Here, we introduce a phonon-...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
|
| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-025-00999-x |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Abstract A central goal of quantum information science is transferring qubits between space, time, and modality. Spin-based systems in solids are promising quantum memories, but high-fidelity transfer of their quantum states to telecom optical fields remains challenging. Here, we introduce a phonon-mediated interface between spins in a diamond nanobeam optomechanical crystal and telecom optical fields by a simultaneous deep-subwavelength confinement of optical and acoustic fields with mode volumes $${V}_{{\rm{mech}}}/{\Lambda }_{{\rm{p}}}^{3} \sim 1{0}^{-5}$$ V mech / Λ p 3 ~ 1 0 − 5 and V opt/λ 3 ~ 10−3, respectively. This confinement boosts the spin-mechanical coupling rate of Group-IV silicon vacancy (SiV−) centers by an order of magnitude to ~ 32 MHz while retaining high acousto-optical couplings. The optical cavity couples to the spin irrespective of the emitter’s native excited states, avoiding spectral diffusion. Using Quantum Monte Carlo simulations, we estimate heralded entanglement fidelities exceeding 0.96 between two such interfaces. We anticipate broad utility beyond diamond emitter-telecom systems to most solid-state quantum memories. |
|---|---|
| ISSN: | 2056-6387 |