Quantum control of hybrid nuclear-electronic qubits

Abstract

Pulsed magnetic resonance is a wide-reaching technology allowing the quantum state of electronic and nuclear spins to be controlled on the timescale of nanoseconds and microseconds respectively. The time required to flip either dilute electronic or nuclear spins is orders of magnitude shorter than their decoherence times, leading to several schemes for quantum information processing with spin qubits. We investigate instead the novel regime where the eigenstates approximate 50:50 superpositions of the electronic and nuclear spin states forming "hybrid nuclear-electronic" qubits. Here we demonstrate quantum control of these states for the first time, using bismuth-doped silicon, in just 32 ns: this is orders of magnitude faster than previous experiments where pure nuclear states were used. The coherence times of our states are five orders of magnitude longer, reaching 4 ms, and are limited by the naturally-occurring 29Si nuclear spin impurities. There is quantitative agreement between our experiments and no-free-parameter analytical theory for the resonance positions, as well as their relative intensities and relative Rabi oscillation frequencies. In experiments where the slow manipulation of some of the qubits is the rate limiting step, quantum computations would benefit from faster operation in the hybrid regime.

20 pages, 8 figures, new data and simulations

References in corpus (8)

• Quantum Computing
• Electron spin coherence exceeding seconds in high purity silicon
• Solid state quantum memory using the 31P nuclear spin
• Decoherence in Crystals of Quantum Molecular Magnets
• Quantum many-body theory of qubit decoherence in a finite-size spin bath
• Bismuth in silicon qubits: the role of EPR cancellation resonances
• Electrical activation and electron spin resonance measurements of implanted bismuth in isotopically enriched silicon-28
• Full coherent control of nuclear spins in an optically pumped single quantum dot

Cited by in corpus (21)

• Atomic clock transitions in silicon-based spin qubits
• Quantum many-body theory for electron spin decoherence in nanoscale nuclear spin baths
• Dynamical decoupling based quantum sensing: Floquet spectroscopy
• Room-temperature high-speed nuclear-spin quantum memory in diamond
• Quantum bath-driven decoherence of mixed spin systems
• Selective optical addressing of nuclear spins through superhyperfine interaction in rare-earth doped solids
• Universal quantum computing using electro-nuclear wavefunctions of rare-earth ions
• Hyperfine Clock Transitions of Bismuth Donors in Silicon Detected by Spin Dependent Recombination
• Phonon-assisted relaxation and decoherence of singlet-triplet qubits in Si/SiGe quantum dots
• Direct Observation of Collective Electronuclear Modes About a Quantum Critical Point
• Entropy bounds for quantum processes with initial correlations
• Keeping a spin qubit alive in natural silicon: Comparing optimal working points and dynamical decoupling
• Pulsed Low-Field Electrically Detected Magnetic Resonance
• Probing strongly hybrid nuclear-electronic states in a model quantum ferromagnet
• Extending the Electron Spin Coherence Time of Atomic Hydrogen by Dynamical Decoupling
• Trapped-Ion Entangling Gates Robust Against Qubit Frequency Errors
• Addressing spin transitions on 209Bi donors in silicon using circularly-polarized microwaves
• Time-crystalline behavior in central-spin models with Heisenberg interactions
• Coherence protection in coupled quantum systems
• Properties of collective Rabi oscillations with two Rydberg atoms
• Hilbert Space Fragmentation and Subspace Scar Time-Crystallinity in Driven Homogeneous Central-Spin Models