Sub-microsecond high-fidelity dispersive readout of a spin qubit with squeezed photons
Abstract: Fast and high-fidelity qubit measurement is essential for realizing quantum error correction, which is in turn a key ingredient to universal quantum computing. For electron spin qubits, fast readout is one of the significant road blocks toward error correction. Here we examine the dispersive readout of a single spin in a semiconductor double quantum dot coupled to a microwave resonator. We show that using displaced squeezed vacuum states for the probing photons can improve the qubit readout fidelity and speed. Under condition of proper phase matching, we find that a moderate, and only moderate, squeezing can enhance both the signal-to-noise ratio and the fidelity of the qubit-state readout, and the optimal readout time can be shortened to the sub-microsecond range with above $99\%$ fidelity. These enhancements are achieved at low probing microwave intensity, ensuring non-demolition qubit measurement.
- S. Takeda and A. Furusawa, APL Photonics 4, 060902 (2019).
- H. Riel, Quantum Computing Technology and Roadmap, IEEE 52nd European Solid-State Device Research Conference 306, 25 (2022).
- B. M. Terhal, Rev. Mod. Phys. 87, 307 (2015).
- A. Saraiva and S. D. Bartlett, Nat. Mater. 1 (2022).
- T. Wu and J. Guo, IEEE Electron Device Lett. 41, 1078 (2020).
- R. Raussendorf and J. Harrington, Phys. Rev. Lett. 98, 190504 (2007).
- E. J. Connors, J. J. Nelson, and J. M. Nichol, Phys. Rev. Appl. 13, 024019 (2020).
- X. D. Hu, Nat. Nanotechnol. 14, 735 (2019).
- S. E. Dwyer, G. L. Mansell, and L. McCuller, Galaxies 10, 46 (2022).
- S. Barzanjeh, D. P. DiVincenzo, and B. M. Terhal, Phys. Rev. B 90, 134515 (2014).
- N. Didier, J. Bourassa, and A. Blais, Phys. Rev. Lett. 115, 203601 (2015).
- L. C. G. Govia and A. A. Clerk, New J. Phys. 19, 023044 (2017).
- B. D’Anjou and G. Burkard, Phys. Rev. B 100, 245427 (2019).
- D. F. Walls, Nature 306, 141 (1983).
- W. M. Zhang, R. Gilmore, and D. H. Feng, Rev. Mod. Phys. 4, 867 (1990).
- H. P. Yuen, and V. W. S. Chan, Opt. Lett. 8, 177 (1983).
- C. W. Gardiner and M. J. Collett, Phys. Rev. A 31, 3761 (1985).
- C. Gardiner and P. Zoller, Quantum noise (Springer, 2004).
- L. Mandel and E. Wolf, Optical coherence and quantum optics (Cambridge university press, 1995).
Paper Prompts
Sign up for free to create and run prompts on this paper using GPT-5.
Top Community Prompts
Collections
Sign up for free to add this paper to one or more collections.