Abstract

We investigate the entanglement enhancement of the two-mode squeezed vacuum state using various combinations of photon additions and photon subtractions. We suppose that a sequence of $N$ operations are performed on each mode and on a single mode of the two-mode squeezed vacuum state, each operation being photon addition or photon subtraction; then there are $2^N$ possible combinations of operations in total. We calculate the entanglement for all the photon-added/subtracted states generated by all possible combinations for $N=2$, $N=3$, and $N=4$, respectively, and deduce that the combination of operations alternating between photon addition and photon subtraction enhances the entanglement most effectively, while adding or subtracting $N$ photons repeatedly enhances the entanglement least effectively.

© 2016 Optical Society of America

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