Inductive measurement of optically hyperpolarized phosphorous donor nuclei in an isotopically-enriched silicon-28 crystal

Abstract

We experimentally demonstrate the inductive readout of optically hyperpolarized phosphorus-31 donor nuclear spins in an isotopically enriched silicon-28 crystal. The concentration of phosphorus donors in the crystal was 1.5 x 10${}^{15}$ cm${}^{-3}$, three orders of magnitude lower than has previously been detected via direct inductive detection. The signal-to-noise ratio measured in a single free induction decay from a 1 cm${}^3$ sample ($\approx 10^{15}$ spins) was 113. By transferring the sample to an X-band ESR spectrometer, we were able to obtain a lower bound for the nuclear spin polarization at 1.7 K of 64 %. The ${}^{31}$P-T${}_2$ measured with a Hahn echo sequence was 420 ms at 1.7 K, which was extended to 1.2 s with a Carr Purcell cycle. The T${}_1$ of the ${}^{31}$P nuclear spins at 1.7 K is extremely long and could not be determined, as no decay was observed even on a timescale of 4.5 hours. Optical excitation was performed with a 1047 nm laser, which provided above bandgap excitation of the silicon. The build-up of the hyperpolarization at 4.2 K followed a single exponential with a characteristic time of 577 s, while the build-up at 1.7 K showed bi-exponential behavior with characteristic time constants of 578 s and 5670 s.

arXiv comment8 pages, 6 figures

References in corpus (13)

• Electron spin coherence exceeding seconds in high purity silicon
• Storing quantum information for 30 seconds in a nanoelectronic device
• High-fidelity readout and control of a nuclear spin qubit in silicon
• Solid state quantum memory using the 31P nuclear spin
• Room temperature quantum bit storage exceeding 39 minutes using ionized donors in 28-silicon
• Coherence of Spin Qubits in Silicon
• Fast nuclear spin hyperpolarization of phosphorus in silicon
• Long spin coherence in silicon with an electrical spin trap readout
• Simultaneous sub-second hyperpolarization of the nuclear and electron spins of phosphorus in silicon
• Hyperfine structure and nuclear hyperpolarization observed in the bound exciton luminescence of Bi donors in natural Si
• Nuclear Spin Dynamics of Ionized Phosphorus Donors in Silicon
• Efficient Dynamic Polarization of Phosphorus Nuclei in Silicon in Strong Magnetic Fields and Low Temperatures
• Electrically detected spin echoes of donor nuclei in silicon

Cited by in corpus (10)

• Building logical qubits in a superconducting quantum computing system
• Coherent Rabi dynamics of a superradiant spin ensemble in a microwave cavity
• Effective qubit dephasing induced by spectator-qubit relaxation
• Cavity cooling to the ground state of an ensemble quantum system
• DNP-NMR of surface hydrogen on silicon microparticles
• Optical dependence of electrically-detected magnetic resonance in lightly-doped Si:P devices
• Biexponential decay and ultralong coherence of a single qubit
• Mesoscopic Spin Systems as Quantum Entanglers
• NMR study of optically hyperpolarized phosphorus donor nuclei in silicon
• Quantum Gates Between Mesoscopic Spin Ensembles