پديد آورنده :
پوينده، سيما
عنوان :
انتقال اطلاعات كوانتومي در سيستم هاي اسپيني با استفاده از اندازه گيري
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك
صفحه شمار :
هشت، 95ص.: مصور
استاد راهنما :
فرهاد شهبازي
استاد مشاور :
مجتبي اعلايي
توصيفگر ها :
رهيافت پيوستي , هماندهي
استاد داور :
رسول ركني زاده، لاله معمارزاده، وحيد سالاري
تاريخ ورود اطلاعات :
1395/01/15
كد ايرانداك :
ID856 دكتري
چكيده انگليسي :
AbstractQuantum state transfer in spin chains has been always a dif cult and important taskin quantum information theory in which a known or unknown quantum state is trans ferred from one side of the chain to the other side The motivation for using spin chainas information carrier in quantum communication is that using it minimizes the need tocontrol over the system In other word in spin chains with xed interactions betweenspins there is no need for a communication bridge between different physical systemsto save and carry information unlike in other systems such as spin photon systems The most studied mode of transmission so far is to attach a qubit encoding the quan tum information in one side of the spin chain and then leave the system to evolvefreely In this case the encoded information at one side is transferred throughout thechain and quantum state of the other side will be similar to the encoded state In thiswork we will introduce a mechanism for quantum state transmission in spin chainsby using a measurement operator followed by the operation of an unitary gate to en code the information in quantum system In this method the inherent entanglement ofmany body system is used to induce dynamics through a single qubit measurement After encoding the information the system is left to evolve freely and after a speci ctime speci ed by the length of the chain and the strength of its interactions the in formation is transferred The quality of the transmission is determined by a quantitycalled delity In measurement scheme the uniform Hamiltonian of the system doesneed need any engineering and controlling over the interaction Also our calculationsshow that using this method gives a higher delity for a s 1 2 uniform HeisenbergHamiltonian in comparison with the attaching scenario Furthermore in a s 1 2spin chain under the XXZ Hamiltonian measurement induced transport gives a bet ter quality of transmission in the interaction phase The proposed protocol has beeninspired by recent achievements in optical lattice experiments and cold atoms for localaddressability of atoms with the resolution of single sites Keywords Quantum State Transfer Spin Chains Measurement Attaching Scenario Fidelity
استاد راهنما :
فرهاد شهبازي
استاد مشاور :
مجتبي اعلايي
استاد داور :
رسول ركني زاده، لاله معمارزاده، وحيد سالاري
