Role of the electron spin in determining the coherence of the nuclear spins in a quantum dot
Source abstract
Abstract
A huge effort is underway to develop semiconductor nanostructures as low-noise qubits. A key source of dephasing for an electron spin qubit in GaAs and in naturally occurring Si is the nuclear spin bath. The electron spin is coupled to each nuclear spin by the hyperfine interaction. The same interaction also couples two remote nuclear spins via a common coupling to the delocalized electron. It has been suggested that this interaction limits both electron and nuclear spin coherence, but experimental proof is lacking. We show that the nuclear spin decoherence time decreases by two orders of magnitude on occupying an empty quantum dot with a single electron, recovering to its original value for two electrons. In the case of one electron, agreement with a model calculation verifies the hypothesis of an electron-mediated nuclear spin-nuclear spin coupling. The results establish a framework to understand the main features of this complex interaction in semiconductor nanostructures.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Quantum and electron transport phenomena · Semiconductor Quantum Structures and Devices · Advancements in Semiconductor Devices and Circuit Design
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (35)
Show source-provided references
1. Loss, D. & DiVincenzo, D. P. Quantum computation with quantum dots. Phys. Rev. A 57, 120–126 (1998).10.1103/PhysRevA.57.120 ↗
2. Chekhovich, E. A. et al. Nuclear spin effects in semiconductor quantum dots. Nature Mater. 12, 494–504 (2013).10.1038/nmat3652 ↗
3. Petta, J. R. et al. Coherent manipulation of coupled electron spins in semiconductor quantum dots. Science 309, 2180–2184 (2005).10.1126/science.1116955 ↗
4. Reilly, D. J. et al. Suppressing spin qubit dephasing by nuclear state preparation. Science 321, 817–821 (2008).10.1126/science.1159221 ↗
5. Shulman, M. D. et al. Suppressing qubit dephasing using real-time Hamiltonian estimation. Nature Commun. 5, 5156 (2014).10.1038/ncomms6156 ↗
6. Bluhm, H. et al. Dephasing time of GaAs electron-spin qubits coupled to a nuclear bath exceeding 200 μs. Nature Phys. 7, 109–113 (2011).10.1038/nphys1856 ↗
7. Witzel, W. M. & Sarma, S. D. Multiple-pulse coherence enhancement of solid state spin qubits. Phys. Rev. Lett. 98, 077601 (2007).10.1103/PhysRevLett.98.077601 ↗
8. Cywiński, L., Witzel, W. M. & Das Sarma, S. Electron spin dephasing due to hyperfine interactions with a nuclear spin bath. Phys. Rev. Lett. 102, 057601 (2009).10.1103/PhysRevLett.102.057601 ↗
9. Klauser, D., Coish, W. A. & Loss, D. Nuclear spin dynamics and Zeno effect in quantum dots and defect centers. Phys. Rev. B 78, 205301 (2008).10.1103/PhysRevB.78.205301 ↗
10. Khaetskii, A. V., Loss, D. & Glazman, L. Electron spin decoherence in quantum dots due to interaction with nuclei. Phys. Rev. Lett. 88, 186802 (2002).10.1103/PhysRevLett.88.186802 ↗
11. Yao, W., Liu, R.-B. & Sham, L. J. Theory of electron spin decoherence by interacting nuclear spins in a quantum dot. Phys. Rev. B 74, 195301 (2006).10.1103/PhysRevB.74.195301 ↗
12. Hanson, R., Kouwenhoven, L. P., Petta, J. R., Tarucha, S. & Vandersypen, L. M. K. Spins in few-electron quantum dots. Rev. Mod. Phys. 79, 1217–1265 (2007).10.1103/RevModPhys.79.1217 ↗
13. Coish, W. A., Fischer, J. & Loss, D. Free-induction decay and envelope modulations in a narrowed nuclear spin bath. Phys. Rev. B 81, 165315 (2010).10.1103/PhysRevB.81.165315 ↗
14. Faribault, A. & Schuricht, D. Integrability-based analysis of the hyperfine-interaction-induced decoherence in quantum dots. Phys. Rev. Lett. 110, 040405 (2013).10.1103/PhysRevLett.110.040405 ↗
15. Kondo, Y. et al. Multipulse operation and optical detection of nuclear spin coherence in a GaAs/AlGaAs quantum well. Phys. Rev. Lett. 101, 207601 (2008).10.1103/PhysRevLett.101.207601 ↗
16. Chekhovich, E. A., Hopkinson, M., Skolnick, M. S. & Tartakovskii, A. I. Suppression of nuclear spin bath fluctuations in self-assembled quantum dots induced by inhomogeneous strain. Nature Commun. 6, 6348 (2015).10.1038/ncomms7348 ↗
17. Reilly, D. J. et al. Exchange control of nuclear spin diffusion in a double quantum dot. Phys. Rev. Lett. 104, 236802 (2010).10.1103/PhysRevLett.104.236802 ↗
18. Warburton, R. J. et al. Optical emission from a charge-tunable quantum ring. Nature 405, 926–929 (2000).10.1038/35016030 ↗
19. Urbaszek, B. et al. Nuclear spin physics in quantum dots: an optical investigation. Rev. Mod. Phys. 85, 79–133 (2013).10.1103/RevModPhys.85.79 ↗
20. Munsch, M. et al. Manipulation of the nuclear spin ensemble in a quantum dot with chirped magnetic resonance pulses. Nature Nanotech. 9, 671–675 (2014).10.1038/nnano.2014.175 ↗
21. Chekhovich, E. A. et al. Structural analysis of strained quantum dots using nuclear magnetic resonance. Nature Nanotech. 7, 646–650 (2012).10.1038/nnano.2012.142 ↗
22. Bulutay, C., Chekhovich, E. A. & Tartakovskii, A. I. Nuclear magnetic resonance inverse spectra of InGaAs quantum dots: atomistic level structural information. Phys. Rev. B 90, 205425 (2014).10.1103/PhysRevB.90.205425 ↗
23. Kloeffel, C. et al. Controlling the interaction of electron and nuclear spins in a tunnel-coupled quantum dot. Phys. Rev. Lett. 106, 046802 (2011).10.1103/PhysRevLett.106.046802 ↗
24. Warburton, R. J. Single spins in self-assembled quantum dots. Nature Mater. 12, 483–493 (2013).10.1038/nmat3585 ↗
25. Kuhlmann, A. V. et al. Charge noise and spin noise in a semiconductor quantum device. Nature Phys. 9, 570–575 (2013).10.1038/nphys2688 ↗
26. Kuhlmann, A. V. et al. A dark-field microscope for background-free detection of resonance fluorescence from single semiconductor quantum dots operating in a set-and-forget mode. Rev. Sci. Instr. 84, 073905 (2013).10.1063/1.4813879 ↗
27. Latta, C. et al. Confluence of resonant laser excitation and bidirectional quantum-dot nuclear-spin polarization. Nature Phys. 5, 758–763 (2009).10.1038/nphys1363 ↗
28. Van Veenendaal, E., Meier, B. & Kentgens, A. Frequency stepped adiabatic passage excitation of half-integer quadrupolar spin systems. Mol. Phys. 93, 195–213 (1998).10.1080/00268979809482204 ↗
29. Smith, J. M. et al. Voltage control of the spin dynamics of an exciton in a semiconductor quantum dot. Phys. Rev. Lett. 94, 197402 (2005).10.1103/PhysRevLett.94.197402 ↗
30. Dreiser, J. et al. Optical investigations of quantum dot spin dynamics as a function of external electric and magnetic fields. Phys. Rev. B 77, 075317 (2008).10.1103/PhysRevB.77.075317 ↗
31. Kroner, M. et al. Resonant two-color high-resolution spectroscopy of a negatively charged exciton in a self-assembled quantum dot. Phys. Rev. B 78, 075429 (2008).10.1103/PhysRevB.78.075429 ↗
32. Maletinsky, P., Badolato, A. & Imamoglu, A. Dynamics of quantum dot nuclear spin polarization controlled by a single electron. Phys. Rev. Lett. 99, 056804 (2007).10.1103/PhysRevLett.99.056804 ↗
33. Paget, D., Lampel, G., Sapoval, B. & Safarov, V. I. Low field electron-nuclear spin coupling in gallium arsenide under optical pumping conditions. Phys. Rev. B 15, 5780–5796 (1977).10.1103/PhysRevB.15.5780 ↗
34. Coish, W. A. & Baugh, J. Nuclear spins in nanostructures. Phys. Status Soldi B 246, 2203–2215 (2009).10.1002/pssb.200945229 ↗
35. Press, D. et al. Ultrafast optical spin echo in a single quantum dot. Nature Photon. 4, 367–370 (2010).10.1038/nphoton.2010.83 ↗