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Quantum computational chemistry
With small quantum computers becoming a reality, first applications are eagerly sought. Quantum chemistry presents a spectrum of computational problems, from relatively easy to classicallyExpand
Quantum random number generation
Self-testing quantum random number generators (QRNGs) are studied, in which verifiable randomness can be generated without trusting the actual implementation, and an intermediate category is self-testing QRNG, which provides a tradeoff between the trustworthiness on the device and the random number generation speed. Expand
Theory of variational quantum simulation
This work completes the theory of variational quantum simulation of general real and imaginary time evolution and it is applicable to near-term quantum hardware. Expand
Variational Quantum Algorithms
An overview of the field of Variational Quantum Algorithms is presented and strategies to overcome their challenges as well as the exciting prospects for using them as a means to obtain quantum advantage are discussed. Expand
Intrinsic randomness as a measure of quantum coherence
Based on the theory of quantum mechanics, intrinsic randomness in measurement distinguishes quantum effects from classical ones. From the perspective of states, this quantum feature can be summarizedExpand
Variational ansatz-based quantum simulation of imaginary time evolution
This work proposes a variational algorithm that is hybrid, suitable for error mitigation and can exploit shallow quantum circuits, and can be implemented with current quantum computers, and uses it to find the ground-state energy of many-particle systems. Expand
Source-independent quantum random number generation
This work proposes a source-independent scheme for quantum random number generation in which output randomness can be certified, even when the source is uncharacterized and untrusted, and takes into account the finite-key effect with the composable security definition. Expand
An integrated space-to-ground quantum communication network over 4,600 kilometres
An integrated space-to-ground quantum communication network that combines a large-scale fibre network of more than 700 fibre QKD links and two high-speed satellite- to-ground free-space QKd links is demonstrated, achieving quantum key distribution between more than 150 users over a combined distance of 4,600 kilometres. Expand
Variational quantum simulation of imaginary time evolution
Imaginary time evolution is a powerful tool for studying quantum systems. While it is simple to simulate with a classical computer, the time and memory requirements scale exponentially with theExpand
Variational quantum algorithms for discovering Hamiltonian spectra
Calculating the energy spectrum of a quantum system is an important task, for example to analyse reaction rates in drug discovery and catalysis. There has been significant progress in developingExpand