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The Unruh effect can not only arise out of the entanglement between modes ofleft and right Rindler wedges, but also between modes of future and past lightcones. We explore the geometric phase resulting from this timelike entanglementbetween the future and past, showing that it can be captured in a simple$\Lambda$-system. This provides an alternative paradigm to the Unruh-deWittdetector. The Unruh effect has not been experimentally verified because theaccelerations needed to excite a response from Unruh-deWitt detectors areprohibitively large. We demonstrate that a stationary but time-dependent$\Lambda$-system detects the timelike Unruh effect with current technology.

The Berry phase from the entanglement of future and past light cones: detecting the timelike Unruh effect