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Experimental Implementation of Efficient Quantum Pseudorandomness on a 12-Spin System.
Jun Li1,2,3,4, Zhihuang Luo1,2,5, Tao Xin1,2,4
1Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.
Physical Review Letters
|August 7, 2019
Summary
Researchers experimentally generated quantum pseudorandomness using a 12-qubit system. This achievement in quantum computing demonstrates a method for creating unitary designs, crucial for future quantum technologies.
Area of Science:
- Quantum Information Science
- Experimental Quantum Physics
Background:
- Quantum pseudorandomness (unitary designs) is vital for quantum technologies.
- Efficient theoretical construction of pseudorandom unitaries contrasts with experimental realization challenges.
Purpose of the Study:
- To experimentally generate and detect quantum pseudorandomness.
- To probe the growth of quantum pseudorandomness in a physical system.
- To validate a novel indicator for quantum pseudorandomness.
Main Methods:
- Utilized a 12-qubit nuclear magnetic resonance (NMR) system.
- Applied random sequences to nuclear spins for random quantum evolutions.
- Employed multiple-quantum coherence distribution to monitor pseudorandomness growth.
Main Results:
- Successfully generated quantum pseudorandomness on a 12-qubit NMR platform.
- Observed rapid formation of unitary designs through random quantum evolutions.
- Measured spreading of quantum coherences, confirming substantial pseudorandomness.
Conclusions:
- Demonstrated experimental feasibility of quantum pseudorandomness generation at the 12-qubit scale.
- The multiple-quantum coherence indicator effectively probes pseudorandomness.
- Paves the way for exploring quantum randomness in larger quantum processors.
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