A quantum eraser is proposed that operates in a domain that does not
have any classical counterpart. This quantum eraser utilizes the
complementary aspect between entanglement and single-partite
properties of composite quantum systems. Consequently, in contrast
to the duality of visibility and which-path information which
establish features of single quantum systems, here, properties of
composite quantum systems are considered. In composite quantum
systems entanglement might emerge which is of genuine quantum
origin. This nonclassical correlation mutually exclude the
single-partite properties of the subsystems of the composite quantum
system. The single-partite properties can be describes by wave- and
particle properties, i.e. the standard wave-particle duality.
Remarkably, entanglement can be considered as a resource for
observables that do not exist in classical physics. In a bipartite
photon system, this observable is the two-particle visibility which
describes the phase relations that are shared between both photons
of the composite system. The complementary aspect between
two-particle visibility and single-partite properties of the
subsystems prevents us from the observation of single-partite
properties in an entangled biphoton system. The quantum eraser
erases the two-partite visibility and retrieves single-partite
properties in form of single-particle visibility for both of the two
photons. Thus, both observables contain phase information giving
rise to interference effects. Here, complementarity is explicitly
enforced by entanglement in a quantitative manner.
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