DILUTION REFRIGERATOR FOR SCALABLE QUANTUM NETWORKS
Abstract
Quantum technologies are now emerging with astonishing capabilities that are unmatched by their classical counterparts, such as unconditionally secure communication, computing of classically hard problems, and sensing beyond the standard quantum (Heisenberg) limit. Quantum emitters in diamond, such as the nitrogen vacancy (NV) and silicon vacancy (SiV) color centers, have emerged as leading platforms for solid-state spin qubits. High-fidelity logic gates, error correction, and long-range entanglement have already been demonstrated, but improved experimental techniques are required to enable scalable systems. The NV and SiV, along with recently isolated color centers such as the germanium-vacancy (GeV) and the tin-vacancy (SnV), suffer from spin ground state decoherence caused by phonon coupling in diamond. This phonon-mediated decoherence can be suppressed by lowering the diamond sample temperature far below the ground state orbital splitting of the relevant color centers, which is in the range of tens to hundreds of GHz for group IV-vacancy diamond centers. To this end, we propose the use of a dilution refrigerator (DR) to cool diamond samples to temperatures below 100 mK, sufficient to strongly suppress phonon-mediated decoherence of leading color centers. This capability would enable new scientific efforts, including understanding the spin coherence promise of the germanium-vacancy, tin-vacancy, and lead-vacancy (PbV) color centers being developed at MIT. Moreover, it would enable MIT to serve as a node of a scalable scalable metropolitan-size quantum network that would be enabled in the Boston area.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 20, 2023
- Source ID
- FA95502210486
Entities
People
- Dirk Englund
Organizations
- Air Force Office of Scientific Research
- Massachusetts Institute of Technology
- United States Air Force