A paired dual-squeezer Mach-Zehnder interferometer reaches Heisenberg-limited phase sensitivity with direct photon-number-difference detection by overcoming the equal-intensity divergence of standard squeezed-vacuum schemes.
Within each color set, curves from light to dark indicate detection efficiencies η = 0
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Toward Heisenberg-Limited Interferometry with Dual Squeezers
A paired dual-squeezer Mach-Zehnder interferometer reaches Heisenberg-limited phase sensitivity with direct photon-number-difference detection by overcoming the equal-intensity divergence of standard squeezed-vacuum schemes.