Improved Accuracy for Trotter Simulations Using Chebyshev Interpolation
- Zapata Computing Inc., Boston, MA (United States)
- Michigan State Univ., East Lansing, MI (United States)
- Univ. of Toronto, ON (Canada); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Quantum metrology allows for measuring properties of a quantum system at the optimal Heisenberg limit. However, when the relevant quantum states are prepared using digital Hamiltonian simulation, the accrued algorithmic errors will cause deviations from this fundamental limit. In this work, we show how algorithmic errors due to Trotterized time evolution can be mitigated through the use of standard polynomial interpolation techniques. Our approach is to extrapolate to zero Trotter step size, akin to zero-noise extrapolation techniques for mitigating hardware errors. We perform a rigorous error analysis of the interpolation approach for estimating eigenvalues and time-evolved expectation values, and show that the Heisenberg limit is achieved up to polylogarithmic factors in the error. Our work suggests that accuracies approaching those of state-of-the-art simulation algorithms may be achieved using Trotter and classical resources alone for a number of relevant algorithmic tasks.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Michigan State Univ., East Lansing, MI (United States)
- Sponsoring Organization:
- USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- SC0012704; SC0023658
- OSTI ID:
- 2311917
- Alternate ID(s):
- OSTI ID: 3006233
- Journal Information:
- Quantum, Journal Name: Quantum Vol. 8; ISSN 2521-327X
- Publisher:
- Quantum Science Open CommunityCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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