Abstract
The photon subtraction operation is an effective method to enhance an entanglement of the two-mode squeezed vacuum state. We show that it can be well approximated to the two-mode squeezed state with an enhanced squeezing although it is basically a mixed and non-Gaussian state. Such property can be directly observed by the current technology. We also study the continuous variable quantum dense coding with the photon subtracted two-mode squeezed state. It is shown that, in particular squeezing region, its error probability performance can be greatly improved from the original two-mode squeezed state. Since quantum dense coding is the protocol to transmit classical information, our analysis provides an alternative operational meaning of the entanglement involved in the on-off photon subtracted state, compared to the previous results, such as teleportation or the nonlocality, that could help to quantify the entanglement of mixed and non-Gaussian states.
| Original language | English |
|---|---|
| Article number | 17 |
| Pages (from-to) | 87-94 |
| Number of pages | 8 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 5631 |
| DOIs | |
| Publication status | Published - 2005 |
| Externally published | Yes |
| Event | Quantum Optics and Applications in Computing and Communications II - Beijing, China Duration: 2004 Nov 10 → 2004 Nov 12 |
Keywords
- Continuous variable dense coding
- Enhancement of entanglement
- Non-Gaussian state generation
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering