Embedded Files
*This page is not updated regularly.
Quantum information and many-body theory
Quantum mahy-body systems have been identified as ideal candidates for carrying out quantum tasks. On one hand, a number of quantum many body systems have been employed for several aspects of quantum information processing and quantum computation, eg. one-dimensional quantum spin models for quantum state transfer, topological quantum codes for quantum error correction, etc. On the other hand, it has become evident that a quantum information theoretic POV may lead to further insight into quantum many-body systems.
Many neighbors little entanglement
We have recently studied the two-point correlation functions and the bipartite entanglement in the ground state of the exactly-solvable variable-range extended Ising model of qubits in the presence of a transverse field on a one-dimensional lattice. We also show that at the critical point, the bipartite entanglement exhibits a power-law decrease with increasing coordination number irrespective of the partition size. For details, see [arXiv: 2504.01846].
Quantum state transfer on 2D lattices
We proposed protocols for transferring single-qubit states on a quasi-1D lattice by using specific encoding of the single-qubit state into a low-energy rung state, and a subsequent decoding of the transferred state on a receiver rung, where the time evolutions involved in the state transfer protocol are generated by only 1D Hamiltonians. See Phys. Lett. A 511, 129543 (2024) [arXiv: 2306.08440] for details.
Measurement-based quantum protocols and error correction/mitigation
Quantum measurement has been used by a number of quantum algorithms for a variety of tasks over the past two decades. Arguably, the most famous of the measurement-assisted quantum protocols is measurement-based quantum computation. Our research leads to performing physical operations, such as cooling a resonator as well as a single or a number of qubits, charging a quantum battery, etc. via appropriate measurement-driven protocols. We also design measurement-assisted quantum error correction / mittigation protocols for errors that takes a system out of its ground state subspace, which is used to perform specific quantum tasks.
Measurement-based quantum error handling
We propose a measurement-assisted purification-based framework for quantum error correction using a single auxiliary, capable of correcting errors that drive a system from its ground-state subspace into excited-state sectors. We show that the resulting purified state always achieves unit fidelity, while the probability of obtaining any energy of the auxiliary other than its ground state energy yields the success rate of the protocol. See [arXiv: 2512.09745] for details.
Measurement-based quantum battery
We show that harnessing daemonic advantage is possible while charging a quantum battery by first time-evolving the battery collectively with an auxiliary charger, followed by an energy extraction via tracing out the charger. We define the difference between the minimum daemonic ergotropy and the maximum ergotropy of the battery as the daemonic gap at the time where the ergotropy of the battery is maximum. Considering a harmonic mode as the battery and a qubit as the auxiliary charger interacting via Jaynes-Cummings interaction, we show that the daemonic gap can be closed for specific initial passive states of the battery, including the ground state, truncated mixtures of low-lying states, and canonical thermal states. Details in [arXiv: 2511.07243]
Page updated
Google Sites
Report abuse