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We introduce tqix.pis, a library of tqix, for quantum dynamics simulation ofspin ensembles. The library emulates a dynamic process by a quantum circuit,including initializing a quantum state, executing quantum operators, andmeasuring the final state. It utilizes collective processes in spin ensemblesto reduce the dimension from exponentially to quadratically with the number ofparticles, i.e., the quantum state spans in Dicke basis. It also facilitatesthe simulation time with multi-core processors and Graphics Processing Units.The library is thus applicable for the simulation of ensembles of large numberof particles that have collective properties. Various phenomena, such as spinsqueezing, variational quantum squeezing, quantum phase transition, andmany-body quantum dynamics, can be simulated using the library.

tqix.pis: A toolbox for quantum dynamics simulation of spin ensembles in Dicke basis