Low-temperature system for integrated quantum nodes based on atom-like systems in nanophotonic cavities
Abstract
Developing a reliable interface between photons and quantum emitters is an outstanding challenge in quantum science. Such interfaces are essential for quantum networks and enable quantum devices operating at the single photon level. Despite significant effort, there is no known scalable path to integrated quantum circuits involving coherent qubits coupled through optical photons. The Silicon-Vacancy (SiV) center in diamond has recently emerged as an exceptional platform for realizing quantum nodes. SiV centers have unique properties, including a strong optical transition that is spectrally stable with a narrow inhomogeneous distribution and exhibits lifetime-limited linewidths even inside nanostructures. These optical properties, combined with stable and optically-addressable electronic spin states, make the SiV a prime candidate for realizing scalable nanophotonic quantum devices. For example, we recently demonstrated a quantum optical switch using a single deterministically positioned SiV in a diamond nanophotonic device. The main drawback of SiV centers arises from the spin-orbit coupling that limits their spin coherence times to ~50 ns at T=4 K by a thermal relaxation process. We recently showed that this decoherence rate is proportional to the occupation of 50 GHz (~2 K) phonons. This relaxation can be completely suppressed by operating below 150 mK. We therefore propose to acquire a dilution refrigerator and integrate it with state-of-the-art SiV-based diamond nanophotonic devices. This system will enable groundbreaking experiments in quantum nonlinear optics and scalable quantum networks with applications in fields ranging from quantum information processing to quantum metrology, enabling major advances in DoD programs including AFOSR MURIs ÒIntegrated Hybrid Nano-Photonic CircuitsÓ and ÒMultifunctional Light-Matter Interfaces based on Neutral Atoms & SolidsÓ, ARO MURIs ÒMulti-Qubit Enhanced Sensing & MetrologyÓ, and ONR MURI ÒQuantum Opto-Mechanics with Atoms and Nanostructured DiamondÓ. In addition, it will enable key research within the ARL ÒCenter for Distributed Quantum InformationÓ and DARPA QuINESS programs.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 11, 2018
- Source ID
- W911NF1610173
Entities
People
- Mikhail Lukin
Organizations
- Army Contracting Command
- Harvard University
- United States Army