K. Hasselmann
Keywords (parts 1-4): metron / unified theory / wave particle duality / higher-dimensional gravity / solitons / Maxwell-Dirac-Einstein system / Standard Model / EPR paradox / Bell's theorem / arrow of time
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We present a feasible scheme to implement the non-deterministic quantum logic operation of Knill, Laflamme and Milburn (Nature, 409, 46-52(2001)) by using a teleportation protocol, which requires only single-photon sources, linear optical elements and photon detectors.
Knill, Laflamme, and Milburn recently showed that non-deterministic quantum logic operations could be performed using linear optical elements, additional photons (ancilla), and post-selection based on the output of single-photon detectors [Nature 409, 46 (2001)]. Here we report the experimental demonstration of two logic devices of this kind, a destructive controlled-NOT (CNOT) gate and a quantum parity check. These two devices can be combined with a pair of entangled photons to implement a conventional (non-destructive) CNOT that succeeds with a probability of 1/4.
We consider how recent experimental progress on deterministic solid state spin-photon interfaces enable the construction of a number of key elements of quantum networks. After reviewing some of the recent experimental achievements, we discuss their integration into Bell state analyzers, quantum non-demolition detection, and photonic cluster state generation. Finally, we outline how these elements can be used for long-distance entanglement generation and quantum key distribution in a quantum network.
Multiplexed Pseudo-Deterministic Photon Source with Asymmetric Switching Elements
本文提出一种利用热垫等单向开关元件特性的多路复用伪确定性光子源新设计，通过在时间多路复用设备中引入多个开关，使慢速开关元件能适应更快的泵浦速率，其预期性能主要受限于集成光子芯片组内光波导的固有损耗率。
The data of the experiment of Schiller et al., Phys. Rev. Lett. 77 (1996) 2933, are alternatively evaluated using the maximum likelihood estimation. The given data are fitted better than by the standard deterministic approach. Nevertheless, the data are fitted equally well by a whole family of states. Standard deterministic predictions correspond approximately to the envelope of these maximum likelihood solutions.
Weak versus deterministic macroscopic realism, and Einstein-Podolsky-Rosen's elements of reality
本文通过分析Leggett-Garg不等式的违反，提出弱宏观实在论（wMR），指出其与违反该不等式的系统相容且能解决宏观实在论失效与量子测量假设的矛盾，同时区分了弱与确定性宏观实在论。
With the decline of the Copenhagen interpretation of quantum mechanics and the recent experiments indicating that quantum mechanics does actually embody 'objective reality', one might ask if a 'mechanical', conceptual model for quantum mechanics could be found. We propose such a model. Vacuum energy fluctuations imply mass fluctuations and, through general relativity, curvature fluctuations. And those fluctuations are indicated by fluctuations of the metric tensor. The metric tensor fluctuations can 'explain' the uncertainty relations and non-commuting properties of conjugate variables. We arg…
Deterministic quantum search with adjustable parameters: implementations and applications
本文提出一种参数可调的确定性量子搜索框架，突破了现有广义Grover迭代中参数取值范围的限制，并成功解决了两种先前方案无法确定性求解的问题。
Quantum mechanics can find a needle in a haystack every time
本文在可编程光子集成电路上实现确定性Grover算法，验证其相较原始算法更准确且对硬件缺陷更鲁棒，并在4至10元素数据库中达到99.77±0.05%的平均成功率。
Generalizing de Broglie's hypothesis, we show that the basic quantum behavior of ordinary field theory can be retrieved in a semi-classical and geometrical way from the assumption of intrinsic periodicity of elementary systems. The geometrodynamical description of interactions that arises in from this approach provides an intuitive interpretation of Maldacena's conjecture and it turns out to be of the same type of the one prescribed by general relativity.
Sorting quantum fields into different modes according to their Fock-space quantum numbers is a highly desirable quantum operation. In this Letter, we show that a pair of two-level emitters, chirally coupled to a waveguide, may scatter single- and two-photon components of an input pulse into orthogonal temporal modes with a fidelity $\gtrsim 0.9997$. We develop a general theory to characterize and optimize this process and observe an interesting dynamics in the two-photon scattering regime: while the first emitter gives rise to a complex multimode field, the second emitter recombines the field …
Development of exponentially scaling methods has seen great progress in tackling larger systems than previously thought possible. One such technique, full configuration interaction quantum Monte Carlo, is a useful algorithm that allows exact diagonalization through stochastically sampling determinants. The method derives its utility from the information in the matrix elements of the Hamiltonian, along with a stochastic projected wave function, to find the important parts of Hilbert space. However, the stochastic representation of the wave function is not required to search Hilbert space effici…
Minimal Proper Time and Deterministic Microstates: Emergent Quantum Fields and Relativistic Spacetime
从因果有序事件的确定性前几何基底出发，通过对微观历史粗粒化，在低能时导出有效量子动力学，给出最小固有时间步微观解释，红外极限恢复标准量子场论，还为涌现相对论时空几何提供自然框架。
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