  Quantum secret sharing is a method for sharing a secret quantum state among a
number of individuals such that certain authorized subsets of participants can
recover the secret shared state by collaboration and other subsets cannot. In
this paper, we first propose a method for sharing a quantum secret in a basic
$(2,3)$ threshold scheme, only by using qubits and the 7-qubit CSS code. Based
on this $(2,3)$ scheme, we propose a new $(n, n)$ scheme and we also construct
a quantum secret sharing scheme for any quantum access structure by induction.
Secondly, based on the techniques of performing quantum computation on 7-qubit
CSS codes, we introduce a method that authorized subsets can perform universal
quantum computation on this shared state, without the need for recovering it.
This generalizes recent attempts for doing quantum computation on $(n, n)$
threshold schemes.
