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Ancilla-Assisted Measurements on Quantum Ensembles: General Protocols and Applications in NMR Quantum Information Processing


Affiliations
1 Department of Physics and NMR Research Centre, Indian Institute of Science Education and Research, Pune 411 008, India
2 Department of Physics and Centre for Quantum Information and Quantum Computation, Indian Institute of Science, Bengaluru 560 012, India
 

Quantum ensembles form easily accessible architectures for studying various phenomena in quantum physics, quantum information science and spectroscopy. Here we review some recent protocols for measurements in quantum ensembles by utilizing ancillary systems. We also illustrate these protocols experimentally via nuclear magnetic resonance techniques. In particular, we shall review noninvasive measurements, extracting expectation values of various operators, characterizations of quantum states and quantum processes, and finally quantum noise engineering.

Keywords

Contextuality, Expectation Values, Joint Probabilities, Noninvasive Measurement, Process Tomography.
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  • Ancilla-Assisted Measurements on Quantum Ensembles: General Protocols and Applications in NMR Quantum Information Processing

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Authors

T. S. Mahesh
Department of Physics and NMR Research Centre, Indian Institute of Science Education and Research, Pune 411 008, India
Abhishek Shukla
Department of Physics and NMR Research Centre, Indian Institute of Science Education and Research, Pune 411 008, India
Swathi S. Hegde
Department of Physics and NMR Research Centre, Indian Institute of Science Education and Research, Pune 411 008, India
C. S. Sudheer Kumar
Department of Physics and NMR Research Centre, Indian Institute of Science Education and Research, Pune 411 008, India
Hemant Katiyar
Department of Physics and NMR Research Centre, Indian Institute of Science Education and Research, Pune 411 008, India
Sharad Joshi
Department of Physics and NMR Research Centre, Indian Institute of Science Education and Research, Pune 411 008, India
K. R. Koteswara Rao
Department of Physics and Centre for Quantum Information and Quantum Computation, Indian Institute of Science, Bengaluru 560 012, India

Abstract


Quantum ensembles form easily accessible architectures for studying various phenomena in quantum physics, quantum information science and spectroscopy. Here we review some recent protocols for measurements in quantum ensembles by utilizing ancillary systems. We also illustrate these protocols experimentally via nuclear magnetic resonance techniques. In particular, we shall review noninvasive measurements, extracting expectation values of various operators, characterizations of quantum states and quantum processes, and finally quantum noise engineering.

Keywords


Contextuality, Expectation Values, Joint Probabilities, Noninvasive Measurement, Process Tomography.

References





DOI: https://doi.org/10.18520/cs%2Fv109%2Fi11%2F1987-1996