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We propose a scheme for the detection of qubit-environment entanglement attime $\tau$ which requires only operations and measurements on the qubit, allwithin reach of current experimental state-of-the-art. The scheme works for anytype of interaction which leads to pure dephasing of the qubit as long as theinitial qubit state is pure. It becomes particularly simple when one of thequbit states is neutral with respect to the environment, such as in case of themost common choice of the NV center spin qubit or for excitonic charge qubits,when the environment is initially at thermal equilibrium.

A scheme for direct detection of qubit-environment entanglement generated during qubit pure dephasing