Quantum Coupling Effect between Quantum Dot and Quantum Well in a Resonant Tunneling Photon-Number-Resolving Detector**Supported by the National Basic Research Program of China under Grant No 2011CB925600, the National Natural Science Foundation of China under Grant Nos 11427807, 91321311, 10990100, 11174057 and 61106092, and the Shanghai Science and Technology Committee under Grant No 14JC1406600.

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Excited states of InAs quantum dots (QDs) can be energetically coupled with the confined level of GaAs quantum wells (QWs) in a thin-barrier resonant tunneling diode (RTD). Single charge variation in the coupled QD can effectively switch on/off the resonant tunneling current passing through RTD, not only for efficient single-photon detection but also for photon-number-resolving detection. We present the study of the QD–QW coupling effect in the quantum dot coupled resonant tunneling diode (QD-cRTD) and figure out important factors for further improving the detector performance.