Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W03: Quantum Computing and Other Frontiers in Chemical Physics
3:00 PM–5:24 PM,
Thursday, March 9, 2023
Room: Room 126
Sponsoring
Unit:
DCP
Chair: Steve Smith, South Dakota School of Mines & Technology
Abstract: W03.00006 : Design of molecular excitonic circuits for quantum computing: Theory and application to simple quantum algorithms.*
4:00 PM–4:12 PM
Presenter:
Maria A Castellanos
(Massachusetts Institute of Technology)
Authors:
Maria A Castellanos
(Massachusetts Institute of Technology)
Adam P Willard
(Massachusetts Institute of Technology MIT)
Here, we present a strategy for controlling the dynamics of excitons by constructing circuits of strongly coupled molecular dyes. The programmable state of the exciton can then be exploited to encode the unitary transformation matrix representing a quantum logic gate, or a sequence of transformations representing a quantum algorithm. By studying the evolution of the excitonic circuit under open system conditions, we can assess the effect of the environmental fluctuations on the fidelity of the quantum computation. Specifically, we begin by designing a general method to map a set of universal quantum gates: NOT, Hadamard, π/8 and CNOT. Then, we extend this method to map the 2-qubit Deutsch-Jozsa algorithm - one of the simplest algorithms for which a quantum computer can outperform a classical one. For the latter, we propose and compare the performance of two different strategies: A higher fidelity approach where the entire algorithm is “hard-coded” into a single circuit, and a modular strategy, whereby the algorithm is implemented as a sequence of unitary gate operations. We observe that the fidelity of the encoded quantum operation depends entirely on the chemical and geometrical properties specified for the dyes in the circuit, and that these characteristics can be engineered to reduce the effect of the bath to maintain the integrity of the information encoded.
*This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) under Award DE-SC0019998.
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