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Ladder Operator Block-Encoding

Mar 14, 2025

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2503.11641 [quant-ph]

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Abstract: (arXiv)

We describe and analyze LOBE (Ladder Operator Block-Encoding), a framework for block-encoding second-quantized ladder operators that act upon fermionic and bosonic modes. We numerically benchmark these constructions using models arising in quantum field theories including the quartic oscillator, and phi4 and Yukawa Hamiltonians on the light front. These benchmarks show that LOBE produces block-encodings with fewer non-Clifford operations, fewer block-encoding ancillae and overall number of qubits, and lower rescaling factors for various second-quantized operators as compared to block-encoding frameworks that expand the ladder operators in the Pauli basis. The LOBE constructions also demonstrate favorable scaling with respect to key parameters, including the maximum occupation of bosonic modes, the total number of fermionic and bosonic modes, and the locality of the operators. LOBE is implemented as an open source python package to enable further applications.

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