کنترل درهم تنیدگی در سیستم های کوانتومی بسته از طریق تله اندازی همدوس جمعیت

نوع مقاله : مقاله پژوهشی (نظری)

نویسندگان

1 استادیار، گروه فیزیک، واحد خرم آباد، دانشگاه آزاد اسلامی، خرم آباد، ایران.

2 دکتری، باشگاه پژوهشگران جوان و نخبگان، واحد خرم آباد، دانشگاه آزاد اسلامی، خرم آباد، ایران.

چکیده

در این مقاله، شرایط غیردرهم‌تنیدگی بین اتم پوشیده و گسیل خودبه‌خودی آن را در سیستم لامبدا دوگانه بررسی کردیم. در ابتدا بر اثر برهم کنش میان میدان‌های لیزری و اتم چهارترازی، درهم‌تنیدگی، افزایش می‌یابد. این درهم‌تنیدگی با تغییر شدت میدان‌های اعمال‌شده قابل‌کنترل است؛ به گونه­ای که با اعمال دو میدان جفت‌کننده سیستم درهم‌تنیده است و با اعمال یک میدان جفت‌کننده و یک میدان کاوشگر سیستم اتمی غیردرهم‌تنیده می‌شود.در این پژوهش اثبات شد که گسیل خودبه‌خودی با تغییر دادن جمعیت اتم‌ها در ترازها منبع خوبی برای درهم‌تنیده کردن سیستم است، اما میدان‌ها را به‌گونه‌ای اعمال کردیم که این درهم‌تنیدگی از طریق تله‌اندازی همدوس جمعیت برای اتم‌ها کاهش یابد. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Entanglement control via coherent population trapping in the closed –loop quantum systems

نویسندگان [English]

  • Firouz Amiri 1
  • Zeinab Kordi 2
1 Assistant professor, Department of Physics, Khorram Abad Branch, Islamic Azad University, Khoram Abad, Iran.
2 Ph.D., Young Researchers and Elite Club, Khorram Abad Branch, Islamic Azad University, Khorram Abad, Iran.
چکیده [English]

In this research, the disentanglement conditions between the coated atom and its spontaneous emission in double- lambda quantum system was investigated. Initially, the entanglement increased due to the interaction between the laser fields and the four- level atom. This entanglement can be controlled by changing the intensity of the applied fields. By applying the two coupling fields, the system is entangled and the system would be disentangled with one coupling field and one probe field. The present research demonstrated that spontaneous emission by changing the population of atoms in the alignments is a good source of entanglement, but fields were manipulated in such a way that this entanglement was reduced by coherent trapping of the population for the atoms.

کلیدواژه‌ها [English]

  • Entanglement
  • Closed-loop quantum system
  • Spontaneous emission
  • Reduced entropy
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