Novel Integrated Nuclear-Electron Spins (NINES)
Abstract
The project ÒNovel Integrated Nuclear-Electron Spins (NINES)Ó aims to deliver a high-performance silicon-based quantum processor that blends the exceptional quantum coherence and operation fidelity of nuclear spins with the flexibility and long-range interaction afforded by electron spins. NINES addresses US Army Research Office W911NF-22-S-0006 BAA ÒQUANTUM COMPUTING in the SOLID STATE with SPIN and SUPERCONDUCTING SYSTEMS (QC-S5)Ó, and specifically Topic B: Gates on Advanced Qubits with Superior Performance (GASP). Here, the superior performance is afforded precisely through the integration of nuclear and electron spins, according to two complementary strategies: ÒScaling up inwardsÓ, by adopting high-spin nuclei such as 123Sb and 73Ge, which provide an 8- or 10-dimensional Hilbert space (i.e., the equivalent of at least 3 qubits) within a single nucleus; ÒScaling up outwardsÓ, by using electron spins either as explicit components of the quantum information encoding, or as movable carriers of quantum information and mediators of interactions between the nuclei. Together, these strategies will yield silicon quantum computers with high information density, accelerating the path towards large-scale, error-corrected processors. As a further technological pathway, NINES will develop a quantum processor based on the isoelectronic 119Sn nucleus, which is simple two-level system but integrates favorably with lithographic quantum dots. The performance of the NINES processors will be assessed using novel benchmarking methods developed in tight collaboration between theory and experiment. The use of high-spin nuclei brings a unique opportunity to encode error-correctable logical qubits within a single atom. The perfectly correlated effect of noise on the multiple quantum states of a single nucleus deviates radically from the standard assumptions in the theory of quantum error correction. This will provide a powerful testbed for noise models that more realistically account for non-Markovianity and error correlations in a wide range of systems. Underpinning these objectives will be a strong effort in integrating novel materials, fabrication and characterization methods. We will produce arrays of precision-placed, deterministically-counted donor and isoelectronic spins, implanted in bespoke isotopically-enriched 28Si substrates. We will also integrate piezoelectric actuators within the devices, to locally control the lattice strain and enable unprecedented insights into the effect of strain on the microscopic properties of spins in silicon. The experimental findings will be augmented by sophisticated finite-elements models, unique to our consortium. The goals and deliverables of the NINES program will be pursued by an international consortium comprising leading researchers in the field of spin-based quantum computing in silicon. The project will be led by A. Morello at UNSW Sydney, a pioneer of donor-based quantum computing. Other PIs at UNSW are A. Laucht, who will develop the 73Ge processors, and A. Dzurak, a world expert in nanofabrication and silicon quantum dots. D. Jamieson at the University of Melbourne will lead the deterministic ion implantation effort, and G. Scappucci at TU Delft will develop special isotopically-enriched materials for the project. A. Kiselev and T. Ladd at HRL Laboratories will provide powerful tools for device modeling and spin dynamics calculations. Sandia National Laboratories will contribute the 119Sn processors (D. Luhman and R. Jock) and related theory (W. Witzel); R. Blume-Kohout, K. Young and A. Baczewski will develop performance benchmarking and optimal control methods tailored to the peculiarities of the NINES processors.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 19, 2023
- Source ID
- W911NF2310113
Entities
People
- Andrea Morello
Organizations
- Army Contracting Command
- National Security Agency
- University of New South Wales