High-fidelity entangling gates for silicon qubits
Abstract
Quantum computers have the potential to revolutionize modern technology by solving an important class of problems exponentially faster than any classical computer available today. Silicon qubits based on electron spins in silicon are a leading platform for experimental quantum information processing. A significant challenge to spin-based quantum computing is the generation and preservation of multi-qubit entangled states against dephasing caused by unwanted electric- and magnetic-field noise in semiconductors. The research proposed here directly addresses this challenge by exploring two complimentary approaches to high-fidelity entangling operations in silicon qubits. The first approach is to implement dynamically-corrected gate operations in silicon spin qubits, which are predicted to decrease the effects of noise by many orders of magnitude. The second approach is to increase the interaction strength between distant spins through coherent coupling to quantum phonon resonators. The key innovations of this work are (1) the use of new, bandwidth-limited pulses for dynamically corrected gate operations, and (2) the use of a novel phonon cavity architecture to achieve strong spin-cavity coupling. Together, these approaches have the potential to significantly improve multi-qubit gate fidelities for silicon qubits, addressing the most significant challenge to spin-based quantum computing. If successful, this research will have a transformative impact on silicon quantum computing by enabling implementation of large-scale spin-based quantum information processors.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 21, 2019
- Source ID
- W911NF1910167
Entities
People
- John M Nichol
Organizations
- Army Contracting Command
- United States Army
- University of Rochester