71 citations · 268 across the 15 of their papers we have counts for
15 papers
Extending and measuring dephasing times of nuclear spins in NV centers of diamond
Jingfu Zhang, Swathi S. Hegde, Fedor Jelezko +1
Long coherence times rank among the most important performance measures for many different types of quantum technology. In NV centers of diamond, the nuclear spins provide particul…
Towards the speed limit of high fidelity 2-qubit gates
Swathi S Hegde, Jingfu Zhang, Dieter Suter
Most implementations of quantum gate operations rely on external control fields to drive the evolution of the quantum system. Generating these control fields requires significant e…
Fast Quantum State Tomography in the Nitrogen Vacancy Center of Diamond
Jingfu Zhang, Swathi S. Hegde, Dieter Suter
Quantum state tomography (QST) is the procedure for reconstructing unknown quantum states from a series of measurements of different observables. Depending on the physical system,…
Efficient Implementation of a Quantum Algorithm in a Single Nitrogen Vacancy Center of Diamond
Jingfu Zhang, Swathi S. Hegde, Dieter Suter
Quantum computers have the potential to speed up certain problems that are hard for classical computers. Hybrid systems, such as the nitrogen vacancy (NV) center in diamond, are am…
Efficient quantum gates for individual nuclear spin qubits by indirect control
Swathi S. Hegde, Jingfu Zhang, Dieter Suter
Hybrid quantum registers, such as electron-nuclear spin systems, have emerged as promising hardware for implementing quantum information and computing protocols in scalable systems…
Improved indirect control of nuclear spins in diamond NV centers
Jingfu Zhang, Swathi S. Hegde, Dieter Suter
Hybrid quantum registers consisting of different types of qubits offer a range of advantages as well as challenges. The main challenge is that some types of qubits react only slowl…
Pulse sequences for controlled 2- and 3-qubit gates in a hybrid quantum register
Jingfu Zhang, Swathi S Hegde, Dieter Suter
We propose and demonstrate a quantum control scheme for hybrid quantum registers that can reduce the operation time, and therefore the effects of relaxation, compared to existing i…
Quantum Simulations with Unitary & Nonunitary Controls: NMR implementations
Swathi S Hegde
Feynman, in 1982, proposed the idea of using a quantum simulator to perform quantum simulations. A quantum simulator is basically a controllable quantum system that can mimic the d…
Pauli Decomposition over Commuting Subsets: Applications in Gate Synthesis, State Preparation, and Quantum Simulations
Swathi S. Hegde, K. R. Koteswara Rao, T. S. Mahesh
A key task in quantum computation is the application of a sequence of gates implementing a specific unitary operation. However, the decomposition of an arbitrary unitary operation…
Ancilla assisted measurements on quantum ensembles: General protocols and applications in NMR quantum information processing
T. S. Mahesh, Abhishek Shukla, Swathi S. Hegde +4
Quantum ensembles form easily accessible architectures for studying various phenomena in quantum physics, quantum information science, and spectroscopy. Here we review some recent…
NMR Investigation of the Quantum Piegonhole Effect
Anjusha V. S., Swathi S. Hegde, T. S Mahesh
Quantum simulators based on nuclear spin-systems controlled by NMR techniques have been used for studying various quantum phenomena. In this work, using a four-qubit NMR quantum si…
Engineered Decoherence: Characterization and Suppression
Swathi S. Hegde, T. S. Mahesh
Due to omnipresent environmental interferences, quantum coherences inevitably undergo irreversible transformations over certain time-scales, thus leading to the loss of encoded inf…
Quantum simulations of a particle in one-dimensional potentials using NMR
Ravi Shankar, Swathi S. Hegde, T. S. Mahesh
A classical computer simulating Schrodinger dynamics of a quantum system requires resources which scale exponentially with the size of the system, and is regarded as inefficient fo…
Freezing a Quantum Magnet by Repeated Quantum Interference: An Experimental Realization
Swathi S. Hegde, Hemant Katiyar, T. S. Mahesh +1
We experimentally demonstrate the phenomenon of dynamical many-body freezing in a periodically driven Ising chain. Theoretically [Phys. Rev. B 82, 172402 (2010)], for certain value…
Black Hole spin dependence of general relativistic multi-transonic accretion close to the horizon
Tapas K. Das, Sankhasubhra Nag, Swathi Hegde +7
We introduce a novel formalism to investigate the role of the spin angular momentum of astrophysical black holes in influencing the behaviour of low angular momentum general relati…