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09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Experimental characterization of quantum dynamics through many-body interactions.
Daniel Nigg1, Julio T Barreiro, Philipp Schindler
1Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.
Physical Review Letters
|February 26, 2013
Summary
Direct characterization of quantum dynamics simplifies quantum process tomography for single-qubit operations. This method efficiently measures quantum system properties like relaxation times using fewer experimental setups.
Area of Science:
- Quantum Information Science
- Atomic Physics
- Quantum Computing
Background:
- Quantum process tomography (QPT) is essential for characterizing quantum systems.
- Traditional QPT requires numerous experimental configurations, limiting efficiency.
- Trapped (40)Ca(+) ions provide a robust platform for quantum information processing.
Purpose of the Study:
- To implement and demonstrate a novel quantum process tomography technique called direct characterization of quantum dynamics (DCQD).
- To apply DCQD to coherent and incoherent single-qubit processes in trapped (40)Ca(+) ions.
- To showcase the efficiency and completeness of DCQD for characterizing quantum dynamics.
Main Methods:
- Utilized quantum correlations with an ancilla qubit to reduce experimental configurations for QPT.
- Employed a single experimental setting to estimate diagonal elements of the process matrix.
- Performed a complete characterization of single-qubit processes using multibody correlations with three ancilla qubits.
Main Results:
- Demonstrated that DCQD significantly reduces the number of experimental configurations needed for QPT.
- Successfully measured relaxation times T(1) and T(2) with a single experimental setup.
- Achieved the first complete characterization of single-qubit processes via a single generalized measurement.
Conclusions:
- DCQD offers a more efficient and practical approach to quantum process tomography.
- This technique is valuable for characterizing quantum dynamics in trapped ion systems.
- The findings pave the way for more advanced quantum control and characterization.
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