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Suppose one wants to certify that a quantum channel is notentanglement-breaking. I consider all four combinations of trusted anduntrusted devices at the input and output of the channel, finding that the mostinteresting is a trusted preparation device at the input and an untrustedmeasurement device at the output. This provides a time-like analogue ofEPR-steering, which turns out to reduce to the problem of joint measurability,connecting these concepts in a different way to other recent work. I suggest afew applications of this connection, such as a resource theory ofincompatibility. This perspective also sheds light on why the BB84 keydistribution protocol can be secure even with an untrusted measuring device,leading to an uncertainty relation for arbitrary pairs of ensembles.

Verifying the quantumness of a channel with an untrusted device