Table 2. Phase noise variance and ratio values of balanced encoding strategies versus simple encoding strategies.

		Theoretical values	Experimental values
			$${\sigma }_x^2$$	$${\sigma }_y^2$$	$${\sigma }_z^2$$	$$\overline{{\sigma }^2}$$
Two-point	Balanced	$${\sigma }_{\phi }^2/2$$	0.02371	–	–	0.02371
	Simple	$$2{\sigma }_{\phi }^2$$	0.09018	–	–	0.09018
	Bal/Sim	25%	26.3%	–	–	26.3%
Three-point	Balanced	$$2{\sigma }_{\phi }^2/3$$	0.03325	0.03061	–	0.03193
	Simple	$$2{\sigma }_{\phi }^2$$	0.09341	0.09196	–	0.09269
	Bal/Sim	33.3%	35.6%	33.3%	–	34.4%
Four-point	Balanced	$$3{\sigma }_{\phi }^2/4$$	0.03339	0.03692	0.03690	0.03574
	Simple	$$2{\sigma }_{\phi }^2$$	0.09450	0.09502	0.09157	0.09370
	Bal/Sim	37.5%	35.3%	38.9%	40.3%	38.1%