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  ______   __   __   ______     ______    _____   
 /_   _//  \ \\/ // |      \\  /_   _//  / ____|| 
 `-| |,-    \ ` //  |  --  //   -| ||-  / //---`' 
   | ||      | ||   |  --  \\   _| ||_  \ \\___   
   |_||      |_||   |______//  /_____//  \_____|| 
   `-`'      `-`'   `------`   `-----`    `----`

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Text this: Quantum memory process with a four-level atomic ensemble