69 citations · 253 across the 11 of their papers we have counts for
11 papers
Level anti-crossings of an NV center in diamond: Decoherence-free subspaces and 3D sensors of microwave magnetic fields
K. Rama Koteswara Rao, Dieter Suter
Nitrogen-vacancy (NV) centers in diamond have become an important tool for quantum technologies. All of these applications rely on long coherence times of electron and nuclear spin…
Optimal photon energies for initialization of hybrid spin quantum registers of NV centers in diamond
K. Rama Koteswara Rao, Yihua Wang, Zingfu Zhang +1
Initializing quantum registers with high fidelity is a fundamental precondition for many applications like quantum information processing and sensing. The electronic and nuclear sp…
Multi-spin-assisted optical pumping of bulk 13C nuclear spin polarization in diamond
Daniela Pagliero, K. R. Koteswara Rao, Pablo R. Zangara +11
One of the most remarkable properties of the nitrogen-vacancy (NV) center in diamond is that optical illumination initializes its electronic spin almost completely, a feature that…
Nonlinear Dynamics of a two-level system of a single spin driven beyond the rotating-wave approximation
K. Rama Koteswara Rao, Dieter Suter
Quantum systems driven by strong oscillating fields are the source of many interesting physical phenomena. In this work, we experimentally study the dynamics of a two-level system…
Characterization of hyperfine interaction between an NV electron spin and a first-shell 13C nuclear spin in diamond
K. Rama Koteswara Rao, Dieter Suter
The Nitrogen-Vacancy (NV) center in diamond has attractive properties for a number of quantum technologies that rely on the spin angular momentum of the electron and the nuclei adj…
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…
Simulation of mirror inversion of quantum states in an XY spin chain using NMR
K. Rama Koteswara Rao, T. S. Mahesh, Anil Kumar
We report an experimental quantum simulation of unitary dynamics of an XY spin chain with pre-engineered couplings. Using this simulation, we demonstrate the mirror inversion of qu…
Ancilla Assisted Quantum State Tomography in Many-Qubit Registers
Abhishek Shukla, K. Rama Koteswara Rao, T. S. Mahesh
The standard method of Quantum State Tomography (QST) relies on the measurement of a set of noncommuting observables, realized in a series of independent experiments. Ancilla Assis…
Monogamy of quantum correlations reveals frustration in a quantum Ising spin system: Experimental demonstration
K. Rama Koteswara Rao, Hemant Katiyar, T. S. Mahesh +3
We report a nuclear magnetic resonance experiment, which simulates the quantum transverse Ising spin system in a triangular configuration and further show that the monogamy of quan…
Violation of Entropic Leggett-Garg Inequality in Nuclear Spins
Hemant Katiyar, Abhishek Shukla, Rama Koteswara Rao +1
We report an experimental study of recently formulated entropic Leggett-Garg inequality (ELGI) by Usha Devi et al. (arXiv: 1208.4491v2 (2012)). This inequality places a bound on th…
Entanglement in a 3-spin Heisenberg-XY chain with nearest-neighbor interactions, simulated in an NMR quantum simulator
K. Rama Koteswara Rao, Anil Kumar
The evolution of entanglement in a 3-spin chain with nearest-neighbor Heisenberg-XY interactions for different initial states is investigated here. In an NMR experimental implement…