Published April 16, 2024
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Experimental Demonstration of Input-Output Indefiniteness in a Single Quantum Device
Creators
- 1. CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China
- 2. CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China
- 3. Hefei National Laboratory, University of Science and Technology of China, Hefei, 230088, China
- 4. QICI Quantum Information and Computation Initiative, Department of Computer Science, The University of Hong Kong, Pokfulam Road, Hong Kong
- 5. HKU-Oxford Joint Laboratory for Quantum Information and Computation
- 6. Department of Computer Science, University of Oxford, Wolfson Building, Parks Road, Oxford, United Kingdom
- 7. Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario, Canada
Description
Quantum theory allows information to flow through a single device in a coherent superposition of two opposite directions, resulting into situations where the input-output direction is indefinite. Here we introduce a theoretical method to witness input-output indefiniteness in a single quantum device, and we experimentally demonstrate it by constructing a photonic setup that exhibits input-output indefiniteness with a statistical significance exceeding 69 standard deviations. Our results provide a way to characterize input-output indefiniteness as a resource for quantum information and photonic quantum technologies and enable tabletop simulations of hypothetical scenarios exhibiting quantum indefiniteness in the direction of time.
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10.1103_PhysRevLett.132.160201.pdf
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Additional details
Identifiers
- DOI
- 10.1103/PhysRevLett.132.160201;
- arXiv
- arXiv:2210.17046;
- Crossref Funder ID
- 10.13039/501100012166; 10.13039/501100001809; 10.13039/501100012226; 10.13039/501100009076; 10.13039/501100002858; 10.13039/100000925; 10.13039/501100012333;
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 132
- Journal Issue
- 16
- Journal Page Range
- 7 pgs.
- ISSN
- 0031-9007
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- Subject category
- S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; S97: MATHEMATICAL METHODS AND COMPUTING;
- Descriptors DEI
- BEAM SPLITTING; DATA TRANSMISSION; EIGENSTATES; EQUIPMENT; INFORMATION THEORY; OPTICAL MODES; PHOTONS; PURE STATES; QUANTUM COMPUTERS; QUANTUM CRYPTOGRAPHY; QUANTUM ELECTRONICS; QUANTUM INFORMATION; QUANTUM MECHANICS; QUANTUM OPTICS; QUBITS; SIMULATION
- Descriptors DEC
- BOSONS; COMMUNICATIONS; COMPUTERS; CRYPTOGRAPHY; ELEMENTARY PARTICLES; INFORMATION; MASSLESS PARTICLES; MECHANICS; OPTICS; OSCILLATION MODES; QUANTUM INFORMATION; QUANTUM STATES
Optional Information
- Contract/Grant/Project number
- 2021YFE0113100; 12374338; 11904357; 12174367; 12204458; 17326616; 2021M700138; 62312; 17300920; SRFS2021-7S02; T45-406/23-R; 2021ZD0301200; 2008085J02; BX2021289
- Notes
- These authors contributed equally to this letter.; Contact Email: bhliu@ustc.edu.cn; Contact Email: cfli@ustc.edu.cn; Contact Email: giulio@cs.hku.hk; Record automatically processed
- Funding organization
- National Key Research and Development Program of China; National Natural Science Foundation of China; Fundamental Research Funds for the Central Universities; University of Science and Technology of China; China Postdoctoral Science Foundation; John Templeton Foundation; USTC Center for Micro- and Nanoscale Research and Fabrication; Hong Kong Research Grant Council; Innovation Program for Quantum Science and Technology; Science and Technological Fund of Anhui Province for Outstanding Youth; China Postdoctoral for Innovative Talents