Solid-state quantum memory using the 31P nuclear spin
By J. Morton, A. Tyryshkin, Richard M. Brown, Shyam Shankar, Brendon W. Lovett, A. Ardavan, T. Schenkel, E. Haller, J. Ager, S. Lyon. Nature, 2008
359 citations recorded by the source corpus.
The transfer of information between different physical forms—for example processing entities and memory—is a central theme in communication and computation. This is crucial in quantum computation, where great effort must be taken to protect the integrity of a fragile quantum bit (qubit). However, transfer of quantum information is particularly challenging, as the process must remain coherent at all times to preserve the quantum nature of the information. Here we demonstrate the coherent transfer of a superposition state in an electron-spin ‘processing’ qubit to a nuclear-spin ‘memory’ qubit, using a combination of microwave and radio-frequency pulses applied to 31P donors in an isotopically pure 28Si crystal. The state is left in the nuclear spin on a timescale that is long compared with the electron decoherence time, and is then coherently transferred back to the electron spin, thus demonstrating the 31P nuclear spin as a solid-state quantum memory. The overall store–readout fidelity is about 90 per cent, with the loss attributed to imperfect rotations, and can be improved through the use of composite pulses. The coherence lifetime of the quantum memory element at 5.5 K exceeds 1 s.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/02eb651efce5f2eda3dce03412fded8e2c2fcda8
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Citations in the corpus
- Isotope engineering of silicon and diamond for quantum computing and sensing applications (2014, methodology): “Isotopically enriched, strained 28Si thin layers were grown by solid-source molecular beam epitaxy (MBE) at the Technical University of Munich (TUM), Germany[42] and by CVD at Princeton University, USA.”
- Silicon quantum electronics (2012, background): “Morton et al. (2008) demonstrated the ability to store and retrieve an arbitrary quantum state of the P electron onto the 31P nucleus, obtaining a quan- 51 tum memory with coherence time T2n > 1 s.”
- Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems (2012, background): “Phosphorus in silicon involves both electron spins and nuclear spins, and features excellent coherence properties [both have spin coherence times T2 > 1s (Morton et al., 2008; Simmons et al., 2011; Tyryshkin et al., 2011)].”
- Natural and artificial atoms for quantum computation (2010, background): “, with nuclear spins in molecules [6, 7] or in phosphorus impurities in silicon [8, 9], photons [10, 11], and so on) are also be briefly covered here.”