  Quantum simulation represents the most promising quantum application to
demonstrate quantum advantage on near-term noisy intermediate-scale quantum
(NISQ) computers, yet available quantum simulation algorithms are prone to
errors and thus difficult to be realized. Herein, we propose a novel scheme to
utilize intrinsic gate errors of NISQ devices to enable controllable simulation
of open quantum system dynamics without ancillary qubits or explicit bath
engineering, thus turning unwanted quantum noises into useful quantum
resources. Specifically, we simulate energy transfer process in a
photosynthetic dimer system on IBM-Q cloud. By employing designed
decoherence-inducing gates, we show that quantum dissipative dynamics can be
simulated efficiently across coherent-to-incoherent regimes with results
comparable to those of the numerically-exact classical method. Moreover, we
demonstrate a calibration routine that enables consistent and predictive
simulations of open-quantum system dynamics in the intermediate coupling
regime. This work provides a new direction for quantum advantage in the NISQ
era.
