تحقق بهبودیافته گیت‌های یکانی کنترل‌شده در مدل محاسباتی کوانتومی یک‌طرفه با استفاده از حساب اندازه‌گیری تعمیم‌یافته
محورهای موضوعی : مهندسی برق و کامپیوتر
محبوبه هوشمند
1
(دانشگاه آزاد اسلامی، واحد مشهد)
منیره هوشمند
2
(دانشگاه بین المللی امام رضا(ع) مشهد)
کلید واژه: بهینه‌سازیحساب اندازه‌گیری تعمیم‌یافتهسنتزگیت‌های یکانی کنترل‌شدهمدل محاسبات کوانتومی یک‌طرفه,
چکیده مقاله :
در مدل محاسبات کوانتومی یک‌طرفه (WQC1)، همبستگي کوانتومي در يک مدل درهم‌تنيده که حالت گرافي يا حالت خوشه‌اي خوانده مي‌شود، باعث مي‌گردد که محاسبات جامع کوانتومي تنها با استفاده از اندازه‌گيري‌هاي تک‌کيوبيتي محقق شود. در WQC1 محاسبات با الگوهای اندازه‌گیری یا به طور خلاصه الگو نمایش داده می‌شوند. مسأله سنتز در مدل WQC1 به صورت استخراج الگو از يک ماتریس يکاني دلخواه ورودي تعريف مي‌شود. معیارهای اصلی در ارزیابی الگوهای اندازه‌گیری در مدل WQC1، اندازه، عمق الگو و تعداد درهم‌تنیدگی‌های الگو است. در این مقاله، روش جدیدی برای سنتز گیت‌های یکانی U کنترل‌شده که U یک گیت تک‌کیوبیتی است در مدل WQC1 ارائه شده است. بدین منظور برای نخستین بار، ایده استفاده از حساب اندازه‌گیری تعمیم‌یافته (که از اندازه‌گیری در صفحات مختلف کره بلاخ بهره می‌برد) در مفهوم سنتز در مدل WQC1 استفاده می‌شود. بهینه‌سازی‌هایی نیز مبتنی بر این ایده پیشنهاد شده و با استفاده از آن، روش پیشنهادی برای سنتز گیت‌های یکانی کنترل‌شده در مدل WQC1 معیارهای ارزیابی اندازه، عمق و تعداد درهم‌تنیدگی‌های الگو را نسبت به بهترین کار قبلی به ترتیب به میزان 1/9%، 30% و 1/18% بهبود می‌دهد.
In one-way quantum computation model (1WQC), the quantum correlations in an entangled state, called a cluster state or graph state, are used to perform universal quantum computations using single-qubit measurements. In 1WQC, the computations are shown by measurement patterns or simply patterns. The synthesis problem in the 1WQC model is defined as extracting the pattern from a given arbitrary unitary matrix. The important criteria in evaluating measurement patterns in the 1WQC model, are the size, the depth and the number of entanglements of the pattern. In this paper, a new approach is proposed to synthesize controlled-unitary U gates where U is a single-qubit gate. To this end, for the first time, the idea of applying the extended measurement calculus, which utilizes the measurements in different Bloch sphere planes, is used in the synthesis of the 1WQC model. Some optimizations are proposed for this method and a new approach is presented to synthesize controlled-U gates for the 1WQC model which improves the evaluation criteria of size, depth and the number of entanglements in this model as compared to the best previous result by 9.1%, 30% and 18.1%, respectively.
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