  Bootstrap is a novel and ambitious paradigm for quantum physics. It aims to
solve the target problems by exploiting theoretical constraints from general
physical principles and self-consistency conditions. The bootstrap philosophy
dates back to the 1960s. Its real power has been recognized only recently in,
e.g., conformal field theories and relativistic scattering amplitudes. Inspired
by [X. Han, S. A. Hartnoll, and J. Kruthoff, Phys. Rev. Lett. 125, 041601
(2020)], we report the first bootstrap results in low-energy nuclear physics,
where deuteron, with its Hamiltonian given by pionless effective field theory
in harmonic oscillator space, is solved by directly exploiting the most
fundamental quantum mechanical requirement that probability should never be
negative. Our study shows that the bootstrap method can be helpful in studying
realistic nuclear systems.
