  Measurement-device-independent quantum key distribution (MDI-QKD) provides a
method for secret communication whose security does not rely on trusted
measurement devices. In all existing MDI-QKD protocols, the participant Charlie
has to perform the Bell state measurement or other joint measurements. Here we
propose an MDI-QKD protocol which requires individual measurements only.
Meanwhile, all operations of the receiver Bob are classical, without the need
for preparing and measuring quantum systems. Thus the implementation of the
protocol has a lower technical requirement on Bob and Charlie.
