  In this paper, we present a quantum strong coin flipping protocol. In this
protocol, an EPR pair and a quantum memory storage are made use of, and losses
in the quantum communication channel and quantum memory storage are all
analyzed. We obtain the bias in the fair scenario as a function of $p$, where
$p$ is the probability that the particle in Bob's quantum memory storage is
lost, which means our bias varies as the degree of losses in the quantum memory
storage changes. Therefore we call our protocol semi-loss-tolerant. We also
show that the bias decreases with decreasing $p$. When $p$ approaches 0, the
bias approaches 0.3536, which is less than that of all the previous
loss-tolerant protocols. Details of both parties' optimal cheating strategies
are also given and analyzed. What's more, experimental feasibility is discussed
and demonstrated. Compared with previous qubit-based loss-tolerant SCF
protocols, we introduce the EPR pair to keep our protocol loss-tolerant while
trying to push down the bias. In addition, a quantum memory storage is used and
the losses in it has been taken into account. We obtain the bias in the fair
scenario as a function of $p$, where $p$ is the probability that the particle
in Bob's quantum memory storage is lost, which means our bias varies as the
degree of losses in the quantum memory storage changes. We also show that the
bias decreases with decreasing $p$. When $p$ approaches 0, the bias approaches
0.3536, which is less than that of all the previous loss-tolerant protocols.
Details of both parties' optimal cheating strategies are also given and
analyzed. Besides, experimental feasibility is discussed and demonstrated.
