تحول درهم‌تنیدگی و واهمدوسی حالت‌های بَسِت‌هوند در یک سیستم سه-مدیِ بازِ نامتقارن

نوع مقاله: مقاله پژوهشی کامل

نویسندگان

دانشگاه شهید چمران اهواز

چکیده

یک سیستم کوآنتومی باز شامل یک نوسانگر هماهنگِ نامتقارنِ سه-مدی را در نظر می‌گیریم. با در نظر گرفتن تقریب مارکوی تحول درهم‌تنیدگی و واهمدوسیِ حالت‌های بَسِت‌هوند را در این سیستم مطالعه می‌کنیم. با استفاده از معیار ترانهادۀ مثبت جزئی و خلوص، تأثیر پارامترهای سیستم، حالت اولیه و محیط را بر تحول درهم‌تنیدگی و واهمدوسی بررسی می‎‌‌‌‌‌کنیم. مشاهده می‌شود که تأثیر پارامترهای سیستم و محیط بر تحول درهم‌تنیدگی و خلوص مشابه است؛ به‌گونه‌ای که با افزایش این پارامترها مرگ ناگهانی درهم‌تنیدگی زودتر رخ می‌دهد و خلوص کاهش می‌یابد. از سوی دیگر پارامتر فشردگی رفتار متفاوتی دارد، به‌گونه‌‌ای که با افزایش پارامتر فشردگی خلوص کاهش می‌یابد اما مرگ ناگهانی درهم‌تنیدگی پس از زمان طولانی‌تری رخ می‌دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The evolution of entanglement and decoherence of basset-hound states in an asymmetric three-mode open system

نویسندگان [English]

  • farkhonde abbasnezhad
  • Davood Afshar
  • Mojtaba Jafarpour
Shahid chamran university of Ahvaz
چکیده [English]

In this study, we examined the entanglement and decoherence properties of an open quantum system consisting of a three-mode asymmetric harmonic oscillator. The basset-hound state was initially chosen and Markovian approximation was assumed. Using PPT criterion and purity, we investigated the effect of the parameters of the system, the initial state and the environment on the evolution of the entanglement and decoherence. It was observed that the latter properties are dependent on the environmental parameters (temperature and dissipation coefficient), the initial state parameter (squeezing parameter) and the system parameter (asymmetric parameter). We observed that entanglement and purity are both decreasing functions of temperature, dissipation coefficient and the asymmetric parameter. On the other hand, purity is a decreasing function of the squeezing parameter, while the entanglement is an increasing function of the latter.

کلیدواژه‌ها [English]

  • Entanglement
  • Decoherence
  • Basset-hound states
  • Open quantum systems
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