Measurement-device-independent quantum key distribution with classical Bob and no joint measurement

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 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.