Tạo ra và tính chất phi cổ điển của trạng thái rối thông qua sự tương tác của hai nguyên tử ba mức với trường khoang lượng tử được hỗ trợ bởi một trường cổ điển bên ngoài

Quantum Information Processing - Tập 14 - Trang 1279-1303 - 2015
H. R. Baghshahi1,2,3, M. K. Tavassoly1,2, S. J. Akhtarshenas4
1Atomic and Molecular Group, Faculty of Physics, Yazd University, Yazd, Iran
2The Laboratory of Quantum Information Processing, Yazd University, Yazd, Iran
3Department of Physics, Faculty of Science, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
4Department of Physics, Ferdowsi University of Mashhad, Mashhad, Iran

Tóm tắt

Nghiên cứu sự tương tác của hai nguyên tử ba mức đồng nhất thuộc các loại $$V,\,\varXi $$ và $$\varLambda $$ với một trường khoang lượng tử cùng với một trường cổ điển bên ngoài. Dưới hai phép biến đổi đơn vị nhất định, hệ thống được chuyển đổi thành dạng điển hình của mô hình Jaynes–Cummings cho hai nguyên tử ba mức. Các nghiệm phân tích chính xác của hàm sóng cho các hệ thống nguyên tử–trường được thu được chính xác nhờ kỹ thuật biến đổi Laplace, khi các nguyên tử được chuẩn bị ban đầu ở trạng thái phấn khởi cao nhất và trường lượng tử ở trạng thái đồng pha. Để kiểm tra các đặc tính phi cổ điển của các trạng thái được suy diễn, động lực học của sự rối giữa các tiểu hệ được thảo luận thông qua hai thước đo nổi tiếng, đó là entropy von Neumann của trạng thái giảm và độ âm. Bên cạnh đó, chúng tôi chú ý đến hành vi tạm thời của thống kê lượng tử của các photon của trường và hiện tượng chèn ép. Trong khi đó, ảnh hưởng của trường cổ điển bên ngoài đến các đại lượng vật lý sau đó được phân tích chi tiết. Các kết quả cho thấy rằng các đại lượng được đề cập có thể được điều khiển nhạy cảm qua trường cổ điển bên ngoài. Ngoài ra, các tính toán số liệu cho thấy rằng các đặc tính phi cổ điển trong hệ thống nguyên tử ba mức loại $$\varXi $$ rõ ràng hơn so với hai cấu hình còn lại. Thêm vào đó, đã chỉ ra rằng trong trường hợp đặc biệt của hệ thống nguyên tử loại $$\varLambda $$, hạng của ma trận mật độ giảm của các nguyên tử ba mức không lớn hơn ba, do đó độ âm hoàn toàn nắm bắt sự rối của hệ thống này và sự rối này có thể được tinh chế.

Từ khóa

#nguyên tử ba mức #trường khoang lượng tử #tính phi cổ điển #tình trạng rối #độ âm

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