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Entangled states of many particles are fundamental to quantum computation,quantum simulation,and precision measurement.Bose-Einstein condensate(BEC)of N atoms in a twin-Fock state(TFS),i.e.,in a state with half of the atoms(N/2)each in two orthogonal modes,is massively entangled and enables precision metrology reaching the Heisenberg limit.In this talk,I will report our recent work on generating TFS samples of N ≈11000 atoms by driving a 87Rb BEC undergoing spin mixing through two consecutive quantum phase transitions(QPTs).