J. Chen, Duan, R., Ji, Z., Ying, M., and Yu, J.,
“Existence of Universal Entangler”,
Journal of Mathematical Physics, vol. 49, no. 1, p. 012103, 2008.
J. Chen, Cubitt, T. S., Harrow, A. W., and Smith, G.,
“Entanglement can completely defeat quantum noise”,
Physical Review Letters, vol. 107, no. 25, 2011.