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==Setup, Operation, and Readout==
A TES single-photon detector is voltage-biased by driving a current source I<sub>bias</sub> through a load resistor R<sub>L</sub>. The voltage is chosen to put the TES in its so-called "self-biased region" where the power dissipated in the device is constant with the applied voltage. When a [[photon|photon]] is absorbed by the TES, this extra power is removed by negative [[Electrothermal_feedback|electrothermal feedback]]: the TES [[electrical_resistance|resistance]] increases, causing a drop in TES current, the dissipated Joule power in turn drops, cooling the whole device back to its equilibrium power dissipation in the self-bias region. In a common SQUID readout system, the TES is operated in series with the input coil L which is inductively coupled to a SQUID series-array. Thus a change in TES current manifests as a change in the input [[flux|flux]] to the SQUID, whose output is further amplified and read by room-temperature electronics.
[[File:TES schematic.pdf|thumb|alt=Schematic of TES-SQUID circuit|Schematic of TES-SQUID circuit]]
==Functionality==
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