For a qubit coupled to a single-mode field, heterodyne detection on the field steers the qubit over the full Bloch sphere for the pure entangled states studied, and can produce non-ellipsoidal steering sets for mixed states.
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Quantum steering in a qubit-field system
For a qubit coupled to a single-mode field, heterodyne detection on the field steers the qubit over the full Bloch sphere for the pure entangled states studied, and can produce non-ellipsoidal steering sets for mixed states.