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22 papers · 2 filters
Automatic quantum circuit encoding of a given arbitrary quantum state
Tomonori Shirakawa, Hiroshi Ueda, Seiji Yunoki
We propose a quantum-classical hybrid algorithm to encode a given arbitrarily quantum state onto an optimal quantum circuit with a finite numbe…
Quantum expectation-value estimation by computational basis sampling
Masaya Kohda, Ryosuke Imai, Keita Kanno +3
Measuring expectation values of observables is an essential ingredient in variational quantum algorithms. A practical obstacle is the necessity of a large number of measurements fo…
Hybrid quantum-classical algorithm for computing imaginary-time correlation functions
Rihito Sakurai, Wataru Mizukami, Hiroshi Shinaoka
Quantitative descriptions of strongly correlated materials pose a considerable challenge in condensed matter physics and chemistry. A promising approach to address this problem is…
Error-Mitigated Quantum Metrology via Virtual Purification
Kaoru Yamamoto, Suguru Endo, Hideaki Hakoshima +2
Quantum metrology with entangled resources aims to achieve sensitivity beyond the standard quantum limit by harnessing quantum effects even in the presence of environmental noise.…
Quantifying fermionic nonlinearity of quantum circuits
Shigeo Hakkaku, Yuichiro Tashima, Kosuke Mitarai +2
Variational quantum algorithms (VQAs) have been proposed as one of the most promising approaches to demonstrate quantum advantage on noisy intermediate-scale quantum (NISQ) devices…
Ensemble spin relaxation of shallow donor qubits in ZnO
Vasileios Niaouris, Mikhail V. Durnev, Xiayu Linpeng +6
We present an experimental and theoretical study of the longitudinal electron spin relaxation () of shallow donors in the direct band-gap semiconductor ZnO. is measured…