Advanced Quantum Photonics Memory（现代光量子存储）_徐端颐_9787302673927

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Information memory is an important means of human civilization transmission and a core link of modern information technology. Quantum photonic memory is an essential basic device in the era from classical information to quantum information. Quantum photonic memory should be able to store various quantum states including with any quantum state. Like classical computers,generalpurpose quantum computers require quantum memory for complex computational functions. Depending on the specific computing chip,the memory must store the corresponding quantum information carrier. Usually classical memory measured in bits,and todays classical memory can reach the order of terabytes (240). So the Optical Memory National Engineering Research Centre (OMNERC) at Tsinghua University has been engaged in optical memory research since the early 1990s. Classical memory a memory unit stores only one bit,so the capacity of the memory is actually the number of classical memory units. Due to the characteristics of quantum coherence,one memory unit of quantum memory can store N qubits at one time. Recent studies have shown that quantum photonic memory can store up to 100 qubits and more than all the classical memory. Therefore，Quantum photonic memory is more important in quantum information than classical memory in classical information because quantum information cannot be copied and amplified. The single photon can be efficiently stored in longlived spin states and the ability to resist ambient noise in actual system transportation can improve more. With the gradual advancement of the above research,quantum USB disk will be enter the practical link first. Quantum photonic memory is more important in quantum information than classical memory in classical information because quantum information cannot be copied and amplified. There are many research groups in the world including OMNERC at Tsinghua University engaged in quantum memory research at present that all the independent indexes of quantum photonic memory have good results. Application of quantum photonic memory has just become so widely used while the quantum processor evolves. The quantum processor designed mapping between the two systems. The quantum processor then yield information about the target quantum system. Difficult electronic structure problem of a target molecule can mappe onto the qubits of the quantum processor for solving optimization problems: The solution of an optimization problem can encode into the ground state of a Hamiltonian. This ground state can be using an iterative,quantumclassical algorithm illustrated at bottom. The quantum processor is prepared. The energy of the state is measured and can be used the classical computer. A classical optimization algorithm then suggests a new quantum state. This quantum speedup is possible by being able to encode the component vector. Therefor quantum technologies become part of everyday lives in the coming decades. So quantum information science are rapidly developing,including ultraprecise quantum sensors that could propel fundamental science forward by leaps and bounds; powerful quantum computers to tackle insoluble problems in finance and logistics; and quantum communications to connect these machines as part of longdistance networks,quantum computers operate on the 1000qubit scale. Anticipate millions of qubits are required to solve important problems that are out of reach of todays most powerful supercomputers. There is a global quantum race to develop quantum computers that can help in many important societal challenges from drug discovery to making fertilizer production more energy efficient and solving important problems in nearly every industry,ranging from aeronautics to the financial sector. That works so well and the potential to scaleup by connecting hundreds or even thousands of quantum computing microchips. Towards quantum computers that are robust to errors,suppressing quantum errors by scaling a surface code logical qubit could be the most advanced supercomputer. All experiments validate the unique architecture that the quantum photonic memory been developingproviding an exciting route towards truly largescale quantum computing. We are still growing our research and teaching in this area,with plans for new teaching programs and appointments. Quantum photonic memory will be pivotal in helping to solve some of the most pressing global issues. And with teams spanning the quantum photonic memory and technology research,OMNERC has both a breadth and a depth of expertise in this. I have been engaged in the research of photonic memory and press published a monograph Photonic Memory in 2021,which is very popular with readers. As the world confronted with challenge by exploded increasing amounts of big data. Every day zillions of data generated through the events of the world. I collected and sorted out the new research results of OMRC and at home and abroad in this field in recent years and wrote this monograph,which named Advanced Quantum Photonic Memory & Application.

However,the book was a textbook indeed,mainly introducing theories and principles,with little introduction to engineering applications. In order to meet the needs of the development of light quantum technology and the requirements of the vast number of readers to republish the book. The book supplement to introduction applications of photonic memory technology and devices also added some advanced photonics and memory technology to obtain advanced achievements in recent years. Therefore this book summarized the finally efforts of photonic memory with super resolution and capacity,thereby proposed and described systematically adoption of photonics principles and applied implementation technologies to make big data memory devices. That will have higher memory density,capacity,data transfer rate and low power consumption that is one of the most promising nextgeneration data memory and can be for primary memory,secondary memory and tertiary memory that is photonic RAM,ROM and removable UD. The idea of writing this book was a result of frequent enquiries about the possibility of published a book on Advanced Photonic Memory (APM) in English.

A preliminary survey of the literature showed that numerous researches on almost every aspect of photonics carried out for the past few years,so that the book gives a comprehensive and balanced picture of the field. The book based on quantum physics as quantum entanglement,nanophotonics and photochemistry. From the reversible transfer between a photon and a collective atomic excitation,which in a solidstate device and then accurate expressions. That derived through use of the density matrix equations of motion in detail in order to render this important discussion accessible to general reader a neodymium doped yttrium othersilicate crystal served as quantum memory,with an optical transition with good coherence properties,which employ a thuliumdoped lithium niobate waveguide in conjunction with a photonecho quantum memory protocol. The photons generated in quadratic nonlinear waveguides. that control photon onto nonlinear crystal with entangling,physicmathematical model of heralded photons in solidstate memory,multimode capability of storing photon pair entanglement,photon nonlinear transport,static model of lightmatter entangled state,energytime entangled photons onto the photonic memory,violation of a bell inequality and dynamic model of entangled photons to photonic memory are discussed in detail. Photochemistry solid state memory presents an introduction to another PM based on the principles of two photonphotochemistry and photochromism,include coupled wave equations for different frequency photon,photon nonlinear transport in medium,stereochemistry and isomerisation,preservation of photonic energy during storage,margin analysis based on rigorous modeling，conversion efficiency nanocrystalline film,photochromic dye in amorphous state,electron delocalization valence,error correction and application probabilities. Strong advantages like more performance while less consumption and more ergonomic (less noise,smaller and more flexible cases) stand opposite to disadvantages of more temporary nature (incompatibility and production problems). Photon and light seem to be better than electrons and electric current to carry information. The question how long this will take and the factors influencing it discussed.

The book is organized as follows: Chapter 1 presents an introduction to the latest development in photonic memory including new developments in photonics,MaxwellBloch equations, Application of quantum science and technology, Photonic integration solid state memory, Precision of spinechobased quantum

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