Author

M. Subramanian

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Preprint Sep 2026

Optimal two-mode bosonic loss codes from finite group symmetry

Photon loss is a dominant noise process in bosonic quantum hardware, including superconducting cavities. Fixed-total-photon-number qubit encodings in two bosonic modes retain the loss-detection advantage of dual-rail qubits while supporting photon loss correction. Optimizing entanglement fidelity in this setting for $4...

Argyris Giannisis Manes, M. Subramanian, Liang Jiang · 0 citations

Preprint Aug 2026

Quantum channel learning with limited parallel access

This work derives sample-complexity bounds for estimating entries of the transfer matrix/map to additive accuracy $\epsilon$ with success probability $\ge1-\delta$, under different resources: access to the complex-conjugate channel $\mathcal{E}^*$ and/or parallel access to $c$ copies.

M. Subramanian, Hyukgun Kwon, Liang Jiang · 0 citations

Preprint Aug 2026

Quantum channel learning with limited parallel access

Although the task is learning a particular state, these bounds carry stronger implications than standard state-learning bounds since the learner controls the inputs and ancillary assistance, and establishes a hierarchy of channel-learning resources: self-complex-conjugate channels require two-copy ancilla-assisted acce...

M. Subramanian, Hyukgun Kwon, Liang Jiang · 0 citations