Photonics (Aug 2022)

Implementation of Photonic Phase Gate and Squeezed States via a Two-Level Atom and Bimodal Cavity

  • Shiqing Tang,
  • Xi Jiang,
  • Xinwen Wang,
  • Xingdong Zhao

DOI
https://doi.org/10.3390/photonics9080583
Journal volume & issue
Vol. 9, no. 8
p. 583

Abstract

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We propose a theoretical model for realizing a photonic two-qubit phase gate in cavity QED using a one-step process. The fidelity and probability of success of the conditional quantum phase gate is very high in the presence of cavity decay. Our scheme only employs one two-level atom, and thus is much simpler than other schemes involving multi-level atoms. This proposal can also be applied to generate two-mode squeezed states; therefore, we give three examples, i.e., the two-mode squeezed vacuum state, two-mode squeezed odd coherent state, and two-mode squeezed even coherent state, to estimate the variance of Duan’s criterion when taking into account cavity decay. It is shown that the variance is smaller than 2 for the three squeezed states in most cases. Furthermore, we utilize logarithmic negativity to measure the entanglement, and find that these squeezed states have very high degrees of entanglement.

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