11 papers
Local autonomous inference machines for quantum LDPC codes
Siddhant Midha, Dmitry A. Abanin
We introduce a local and distributed framework for decoding quantum LDPC codes. Built atop belief propagation (BP), the architecture combines strictly local processing of syndrome…
Sharp Bounds on Ground State Energy of the SYK Model
Arpon Basu, Pravesh K. Kothari, Siddhant Midha
We study the Sachdev-Ye-Kitaev (SYK) Hamiltonian on Majorana modes with -body interactions, and prove that $\mathbb{E}\|H_{\operatorname{SYK}}\|_{\o…
Algorithmic Locality via Provable Convergence in Quantum Tensor Networks
Siddhant Midha, Yifan F. Zhang, Daniel Malz +2
Belief propagation has recently emerged as a powerful framework for evaluating tensor networks in higher dimensions, combining computational efficiency with provable analytical gua…
Belief Propagation and Tensor Network Expansions for Many-Body Quantum Systems: Rigorous Results and Fundamental Limits
Siddhant Midha, Grace M. Sommers, Joseph Tindall +1
Belief propagation (BP) provides a scalable heuristic for contracting tensor networks on loopy graphs, but its success in quantum many-body settings has largely rested on empirical…
Beyond Belief Propagation: Cluster-Corrected Tensor Network Contraction with Exponential Convergence
Siddhant Midha, Yifan F. Zhang
Tensor network contraction on arbitrary graphs is a fundamental computational challenge with applications ranging from quantum simulation to error correction. While belief propagat…
Metrology of open quantum systems from emitted radiation
Siddhant Midha, Sarang Gopalakrishnan
We explore the task of learning about the dynamics of a Markovian open quantum system by monitoring the information it radiates into its environment. For an open system with Hilber…
On the microscopics of proximity effects in one-dimensional superconducting hybrid systems
Siddhant Midha, Roshni Singh, Kaveh Gharavi +2
Investigating the microscopic details of the proximity effect is crucial for both key experimental applications and fundamental inquiries into nanoscale devices featuring supercond…
Steady-state dynamics and non-local correlations in thermoelectric Cooper pair splitters
Arnav Arora, Siddhant Midha, Alexander Zyuzin +2
Recent experiments on Cooper pair splitters using superconductor-quantum dot hybrids have embarked on creating entanglement in the solid-state, by engineering the sub-gap processes…
Optimized Current Density Reconstruction from Widefield Quantum Diamond Magnetic Field Maps
Siddhant Midha, Madhur Parashar, Anuj Bathla +3
Quantum Diamond Microscopy using Nitrogen-Vacancy (NV) defects in diamond crystals has enabled the magnetic field imaging of a wide variety of nanoscale current profiles. Intimatel…
Integer Factorization through Func-QAOA
Mostafa Atallah, Haemanth Velmurugan, Rohan Sharma +5
Integer factorization is a significant problem, with implications for the security of widely-used cryptographic schemes. No efficient classical algorithm for polynomial-time intege…
Are Symmetry Protected Topological Phases Immune to Dephasing?
Siddhant Midha, Koustav Jana, Bhaskaran Muralidharan
Harnessing topological phases with their dissipationless edge-channels coupled with the effective engineering of quantum phase transitions is a spinal aspect of topological electro…