  Quantum secret sharing (QSS) and quantum conference key agreement (QCKA)
provide efficient encryption approaches for realizing multi-party secure
communication, which are essential components of future quantum networks. We
present three practical, scalable, verifiable (k, n) threshold QSS protocols
that are secure against eavesdroppers and dishonest players. The proposed QSS
protocols eliminate the need for each player preparing the laser source and
laser phase locking of the overall players. The dealer can implement the
parameter evaluation and get the secret information of each player without the
cooperation from other players. We consider the practical security of the
proposed QSS systems with Trojan-horse attack, untrusted source intensity
fluctuating and untrusted noisy sources. Our QSS systems are versatile, they
can support the QCKA protocol by only modifying the classic post-processing and
requiring no changes to the underlying hardware architecture. We experimentally
implement the QSS and QCKA protocol with five parties over 25 km (55 km) single
mode fibers, and achieve a key rate of 0.0061 (7.14*10^-4) bits per pulse. Our
work paves the way for the practical applications of future QSS and QCKA.
