![]() We also discuss the effect of the circuit depth, barren plateau, readout noise in the model, and the error mitigation solution. In practice, we address different circuit ansatzes in quantum state preparation, including the linear and graph-based ansatzes for preparing different entanglement target states such as representative GHZ and W states. We evaluate the performance of various unitary topologies and the trainability of different optimizers for getting high efficiency. We apply the Fubini-Study distance to be a trainable cost function under various gradient-based optimizers, including the quantum natural gradient approach. Here, we propose a universal compilation-based variational algorithm for the preparation and tomography of quantum states in low-depth quantum circuits. Universal compilation is a training process that compiles a trainable unitary into a target unitary and it serves vast potential applications from quantum dynamic simulations to optimal circuits with deep-compressing, device benchmarking, quantum error mitigation, and so on. However, even if the hurdles can be overcome, we will eventually run into nature. Hurdles exist, for example: silicon will hit problems, with oxide thinness or track width5 new materials or even new paradigms, such as self-assembled nano-devices or molecular electronics, will be needed lots of dollars will be required as Moore’s second law tells us that fabrication costs are also growing exponentially. This exponential progress, first noted4 by Gordon Moore - cofounder and former CEO of Intel - in 1965, has continued ever since. Today many people are familiar with at least the consequences of Moore’s Law - the fastest computer in the shops doubles in speed about every 18 months to two years. This additional freedom could enable future QIT to perform tasks we will never achieve with ordinary IT. ![]() In contrast to conventional IT, where quantum mechanics plays a support role in improving the building blocks, fundamental quantum phenomena play a central role in QIPC - information is stored, processed, and communicated according to the laws of quantum physics. ![]() A new quantum information technology (QIT) could emerge in the future, based on current research in the fields of quantum information processing and communication1–3 (QIPC). ![]()
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