Acta Physica Sinica, Volume. 69, Issue 12, 124202-1(2020)
Fig. 1. Added to or subtracted from a two-mode squeezed vacuum state with different photon numbers (
), the mean photon number variation of these corresponding non-Gaussian states with the squeezed parameter 
).
Fig. 2. Ultimate limit of the phase sensitivity
as a function of the squeezing parameter 
)
Fig. 3. Ultimate limit variation of the phase sensitivity
with the mean photon number: (a) The photon-added two-mode squeezed vacuum state; (b) the photon-subtracted two-mode squeezed vacuum state. Different color curves correspond to add to or subtract from a two-mode squeezed vacuum state with different photon numbers (
). The upper black dashed line denotes the SNL limit, while the below black dashed line represents the HL limit.
Fig. 4. Plot of the signal values of the parity detection against the phase shift for
and some values of (
)
Fig. 5. Phase sensitivity
as a function of the phase shift
for some values of (
) when the photon-added two-mode squeezed vacuum state is considered as interferometer states: (a) For a given initial squeezing parameter
; (b) for a given mean photon number
.
Fig. 6. Plots of the phase sensitivity
as a function of the mean photon number of the photon-added two-mode squeezed vacuum state for some different values of (
) at
: (a) Symmetric photon-added two-mode squeezed vacuum state (
); (b) asymmetric photon-added two-mode squeezed vacuum state (
). The upper black dashed line denotes the SNL limit, while the below black dashed line represents the HL limit.
Fig. 7. Phase sensitivity as a function of the initial squeezing parameter 
) at
: (a) The phase sensitivity obtained by the parity detection; (b) the ultimate limit of phase sensitivity
obtained by the quantum Fisher information.
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Shuai Wang, Yong-Xing Sui, Xiang-Guo Meng.
Category:
Received: Feb. 4, 2020
Accepted: --
Published Online: Dec. 8, 2020
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