Room temperature quantum bit storage exceeding 39 minutes using ionized donors in 28-silicon

Abstract

Quantum memories capable of storing and retrieving coherent information for extended times at room temperature would enable a host of new technologies. Electron and nuclear spin qubits using shallow neutral donors in semiconductors have been studied extensively but are limited to low temperatures ($\le$10 K); however, the nuclear spins of ionized donors have potential for high temperature operation. We use optical methods and dynamical decoupling to realize this potential for an ensemble of 31P donors in isotopically purified 28Si and observe a room temperature coherence time of over 39 minutes. We further show that a coherent spin superposition can be cycled from 4.2 K to room temperature and back, and report a cryogenic coherence time of 3 hours in the same system.

arXiv comment5 pages, 4 figures

References in corpus (15)

• Quantum Computing
• Dynamical suppression of decoherence in two-state quantum systems
• Electron spin coherence exceeding seconds in high purity silicon
• High-fidelity readout and control of a nuclear spin qubit in silicon
• Solid state quantum memory using the 31P nuclear spin
• Atomic clock transitions in silicon-based spin qubits
• Coherence Time of a Solid-State Nuclear Qubit
• Quantum Decoherence of the Central Spin in a Sparse System of Dipolar Coupled Spins
• Stark Tuning of Donor Electron Spins in Silicon
• Unforgeable Noise-Tolerant Quantum Tokens
• Theory of the Stark Effect for P donors in Si
• Effect of pulse error accumulation on dynamical decoupling of the electron spins of phosphorus donors in silicon
• Hyperfine structure and nuclear hyperpolarization observed in the bound exciton luminescence of Bi donors in natural Si
• Optically detected NMR of optically hyperpolarized 31P neutral donors in 28Si
• Nuclear Spin Dynamics of Ionized Phosphorus Donors in Silicon

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