Experimental realization of revival of silenced echo memory protocol in optical cavity

EPJ Web of Conferences ◽

10.1051/epjconf/201819003007 ◽

2018 ◽

Vol 190 ◽

pp. 03007

Author(s):

Mansur Minnegaliev ◽

Konstantin Gerasimov ◽

Ravil Urmancheev ◽

Sergey Moiseev

Keyword(s):

Quantum Efficiency ◽

Optical Cavity ◽

Photon Echo ◽

Quantum Memory ◽

Optical Pulses ◽

Experimental Realization ◽

Light Pulses ◽

The Rose

We demonstrated a photon echo quantum memory for weak input optical pulses on the ROSE protocol in a Tm3+:Y3Al5O12 crystal placed in impedance-matched optical cavity. The quantum efficiency of 21% for a storage of time of 36 µs was achieved for single light pulses.

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Theoretical design of quantum memory unit for under water quantum communication using electromagnetically induced transparency protocol in ultracold 87Rb atoms

International Journal of Quantum Information ◽

10.1142/s0219749920500276 ◽

2020 ◽

Vol 18 (05) ◽

pp. 2050027

Author(s):

Vikas Singh Chauhan ◽

Dixith Manchaiah ◽

Sumit Bhushan ◽

Rohit Kumar ◽

Raghavan K. Easwaran

Keyword(s):

Blue Light ◽

Quantum Communication ◽

Sea Water ◽

Electromagnetically Induced Transparency ◽

Optical Cavity ◽

Optical Trap ◽

Quantum Memory ◽

Light Pulses ◽

Quantum Mechanical Approach ◽

Induced Transparency

In this paper, we present a theoretical proposal to realize Quantum Memory (QM) for storage of blue light pulses (420 nm) using Electromagnetically Induced Transparency (EIT). Three-level lambda-type EIT configuration system is solved in a fully quantum mechanical approach. Storing blue light has the potential application in the field of underwater quantum communication as it experiences less attenuation inside the sea water. Our model works by exciting the relevant transitions of [Formula: see text]Rb atoms using a three-level lambda-type configuration in a Two-Dimensional Magneto-Optical Trap (2D MOT) with an optical cavity inside it. We have estimated Optical Depth inside the cavity (ODc) of [Formula: see text], group velocity ([Formula: see text]) [Formula: see text][Formula: see text]ms[Formula: see text], Delay Bandwidth Product(DBP) of 23 and maximum storage efficiency as [Formula: see text] in our system.

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Enhancing sub-bandgap external quantum efficiency by photomultiplication for narrowband organic near-infrared photodetectors

Nature Communications ◽

10.1038/s41467-021-24500-2 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Jonas Kublitski ◽

Axel Fischer ◽

Shen Xing ◽

Lukasz Baisinger ◽

Eva Bittrich ◽

...

Keyword(s):

Charge Transfer ◽

Quantum Efficiency ◽

External Quantum Efficiency ◽

Near Infrared ◽

Optical Cavity ◽

Hole Injection ◽

Visible Range ◽

Absorption Region ◽

Electromagnetic Signals ◽

Organic Photodetectors

AbstractDetection of electromagnetic signals for applications such as health, product quality monitoring or astronomy requires highly responsive and wavelength selective devices. Photomultiplication-type organic photodetectors have been shown to achieve high quantum efficiencies mainly in the visible range. Much less research has been focused on realizing near-infrared narrowband devices. Here, we demonstrate fully vacuum-processed narrow- and broadband photomultiplication-type organic photodetectors. Devices are based on enhanced hole injection leading to a maximum external quantum efficiency of almost 2000% at −10 V for the broadband device. The photomultiplicative effect is also observed in the charge-transfer state absorption region. By making use of an optical cavity device architecture, we enhance the charge-transfer response and demonstrate a wavelength tunable narrowband photomultiplication-type organic photodetector with external quantum efficiencies superior to those of pin-devices. The presented concept can further improve the performance of photodetectors based on the absorption of charge-transfer states, which were so far limited by the low external quantum efficiency provided by these devices.

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