Abstract
We propose a new scheme based on quantum dot-bimodal cavity coupling system to realize all-optical switch and logic gates in low-photon-number regime. Suppression of mode transmission due to the destructive interference effect is theoretically demonstrated by driving the cavity with two orthogonally polarized pulsed lasers at certain pulse delay. The transmitted mode can be selected by designing laser pulse sequence. The optical switch with high on-off ratio emerges when considering one driving laser as the control. Moreover, the AND/OR logic gates based on photon polarization are achieved by cascading the coupling system. Both proposed optical switch and logic gates work well in ultra-low energy magnitude. Our work may enable various applications of all-optical computing and quantum information processing.
Highlights
The equation (1) is plotted as dashed line in Fig. 3, which is consistent with the previous numerically obtained optimal pulse delay when the coupling strength is large enough. It proves that the mechanism of proposed scheme for suppression of mode transmission is based on destructive interference effect in Quantum dots (QDs)-bimodal cavity system driven by two laser pulses with delay
We demonstrate a new scheme based on coupling system consisting of QD and bimodal cavity to realize all-optical switch and AND/OR logic gates in low-photon-number regime
We propose a design of AND/OR logic gates based on photon polarization
Summary
The equation (1) is plotted as dashed line, which is consistent with the previous numerically obtained optimal pulse delay when the coupling strength is large enough It proves that the mechanism of proposed scheme for suppression of mode transmission is based on destructive interference effect in QD-bimodal cavity system driven by two laser pulses with delay. Within the range of 20 GHz ≤ g/2π ≤ 40 GHz, the relative ratio between transmission energy detected by two detectors keeps higher than 11 dB, while the maximum value is about 16 dB at g/2π = 20 GHz. Similar phenomenon holds when inputs are laser B, merely the mode a transmission is shut at C3 instead. The proposed AND/OR logic gates can work well within a relatively large range of coupling strength
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