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 __   __     ___      _  _    _    _     _____   
 \ \\/ //   / _ \\   | \| || | || | ||  /  ___|| 
  \   //   | / \ ||  |  ' || | || | || | // __   
  / . \\   | \_/ ||  | .  || | \\_/ || | \\_\ || 
 /_//\_\\   \___//   |_|\_||  \____//   \____//  
 `-`  --`   `---`    `-` -`    `---`     `---`

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Text this: Preparation of arbitrary qutrit state based on biphotons