NISQ-era Simulations of Quantum Many-Body Dynamics

Kishor Bharti, Alba Cervera-Lierta, Thi Ha Kyaw +11 more

Noisy quantum computers can in principle perform reliable quantum computations, but truly scalable systems require noise levels lower than are presently achieved. Still, moderate-complexity computations can be performed. This review discusses what is possible in this ``noisy intermediate scale'' quantum (NISQ) era. Topic areas include the simulation of many-body physics and chemistry, combinatorial optimization, and machine learning. It is evident that the NISQ era has produced new paradigms for programming that will be built upon as quantum computers are further perfected.

Francesco Pederiva

Mikhail D. Lukin

Matteo Ippoliti, Kostyantyn Kechedzhi, Roderich Moessner +2 more

NISQ devices are shown to be exceptionally well-suited for simulating periodically driven quantum systems, offering key capabilities for the realization of novel non-equilibrium phases of matter such as the elusive discrete time crystal.

Laurent Sanchez-Palencia

Jiale Yu, Shiyu Wang, Kangqiao Liu +32 more

Entering the era of post-quantum supremacy has given one the ability to precisely control noisy intermediate-scale quantum (NISQ) processors with multiqubits and extract valuable quantum many-body correlation resources for many distinct quantum applications. We here construct quantum many-body thermalized states on a 62-qubit superconducting quantum processor and use them to demonstrate the principle of Maxwell's demon. We further demonstrate the direct effect caused by Maxwell's demon on the charging process of a quantum battery (QB). We depicted the nonequilibrium transportation in our QB through measuring the dynamics of the Shannon entropy to explore its working conditions. Finally, we evaluate the information-to-work conversion by varying the readout fidelity to verify the validity of the Sagawa-Ueda equality within the NISQ processor environment and evaluate the qubit-environment interaction such as the measurement backaction. Our experiment suggests that the superconducting NISQ processor with appropriate error mitigation methods will be an ideal platform for studying quantum information thermodynamics through quantum many-body simulations.