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Jolin SW, Andersson G, Hernández JCR, Strandberg I, Quijandría F, Aumentado J, Borgani R, Tholén MO, Haviland DB. Multipartite Entanglement in a Microwave Frequency Comb. PHYSICAL REVIEW LETTERS 2023; 130:120601. [PMID: 37027873 DOI: 10.1103/physrevlett.130.120601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 02/23/2023] [Indexed: 06/19/2023]
Abstract
Significant progress has been made with multipartite entanglement of discrete qubits, but continuous variable systems may provide a more scalable path toward entanglement of large ensembles. We demonstrate multipartite entanglement in a microwave frequency comb generated by a Josephson parametric amplifier subject to a bichromatic pump. We find 64 correlated modes in the transmission line using a multifrequency digital signal processing platform. Full inseparability is verified in a subset of seven modes. Our method can be expanded to generate even more entangled modes in the near future.
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Affiliation(s)
- Shan W Jolin
- Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - Gustav Andersson
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA
- Department of Microtechnology and Nanoscience MC2, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
| | - J C Rivera Hernández
- Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - Ingrid Strandberg
- Department of Microtechnology and Nanoscience MC2, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
| | - Fernando Quijandría
- Department of Microtechnology and Nanoscience MC2, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
| | - José Aumentado
- National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA
| | - Riccardo Borgani
- Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
- Intermodulation Products AB, SE-823 93 Segersta, Sweden
| | - Mats O Tholén
- Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
- Intermodulation Products AB, SE-823 93 Segersta, Sweden
| | - David B Haviland
- Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
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Liu LC, Qu LY, Wu C, Cotler J, Ma F, Zheng MY, Xie XP, Chen YA, Zhang Q, Wilczek F, Pan JW. Improved Spatial Resolution Achieved by Chromatic Intensity Interferometry. PHYSICAL REVIEW LETTERS 2021; 127:103601. [PMID: 34533368 DOI: 10.1103/physrevlett.127.103601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 07/28/2021] [Indexed: 06/13/2023]
Abstract
Interferometers are widely used in imaging technologies to achieve enhanced spatial resolution, but require that the incoming photons be indistinguishable. In previous work, we built and analyzed color erasure detectors, which expand the scope of intensity interferometry to accommodate sources of different colors. Here we demonstrate experimentally how color erasure detectors can achieve improved spatial resolution in an imaging task, well beyond the diffraction limit. Utilizing two 10.9-mm-aperture telescopes and a 0.8 m baseline, we measure the distance between a 1063.6 and a 1064.4 nm source separated by 4.2 mm at a distance of 1.43 km, which surpasses the diffraction limit of a single telescope by about 40 times. Moreover, chromatic intensity interferometry allows us to recover the phase of the Fourier transform of the imaged objects-a quantity that is, in the presence of modest noise, inaccessible to conventional intensity interferometry.
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Affiliation(s)
- Lu-Chuan Liu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
- Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
| | - Luo-Yuan Qu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
- Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
- Jinan Institute of Quantum Technology, Jinan 250101, People's Republic of China
| | - Cheng Wu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
- Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
| | - Jordan Cotler
- Society of Fellows, Harvard University, Cambridge, Massachusetts 02138 USA
| | - Fei Ma
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
- Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
- Jinan Institute of Quantum Technology, Jinan 250101, People's Republic of China
| | - Ming-Yang Zheng
- Jinan Institute of Quantum Technology, Jinan 250101, People's Republic of China
| | - Xiu-Ping Xie
- Jinan Institute of Quantum Technology, Jinan 250101, People's Republic of China
| | - Yu-Ao Chen
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
- Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
| | - Qiang Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
- Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
- Jinan Institute of Quantum Technology, Jinan 250101, People's Republic of China
| | - Frank Wilczek
- Center for Theoretical Physics, MIT, Cambridge, Massachusetts 02139 USA
- T. D. Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
- Wilczek Quantum Center, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
- Department of Physics, Stockholm University, Stockholm SE-106 91, Sweden
- Department of Physics and Origins Project, Arizona State University, Tempe, Arizona 25287, USA
| | - Jian-Wei Pan
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
- Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
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Qu LY, Liu LC, Cotler J, Ma F, Guan JY, Zheng MY, Yao Q, Xie X, Chen YA, Zhang Q, Wilczek F, Pan JW. Chromatic interferometry with small frequency differences. OPTICS EXPRESS 2020; 28:32294-32301. [PMID: 33114918 DOI: 10.1364/oe.402560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 09/29/2020] [Indexed: 06/11/2023]
Abstract
By developing a 'two-crystal' method for color erasure, we can broaden the scope of chromatic interferometry to include optical photons whose frequency difference falls outside of the 400 nm to 4500 nm wavelength range, which is the passband of a PPLN crystal. We demonstrate this possibility experimentally, by observing interference patterns between sources at 1064.4 nm and 1063.6 nm, corresponding to a frequency difference of about 200 GHz.
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Lake DP, Mitchell M, Sanders BC, Barclay PE. Two-colour interferometry and switching through optomechanical dark mode excitation. Nat Commun 2020; 11:2208. [PMID: 32371992 PMCID: PMC7200651 DOI: 10.1038/s41467-020-15625-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 03/12/2020] [Indexed: 11/09/2022] Open
Abstract
Efficient switching and routing of photons of different wavelengths is a requirement for realizing a quantum internet. Multimode optomechanical systems can solve this technological challenge and enable studies of fundamental science involving widely separated wavelengths that are inaccessible to single-mode optomechanical systems. To this end, we demonstrate interference between two optomechanically induced transparency processes in a diamond on-chip cavity. This system allows us to directly observe the dynamics of an optomechanical dark mode that interferes photons at different wavelengths via their mutual coupling to a common mechanical resonance. This dark mode does not transfer energy to the dissipative mechanical reservoir and is predicted to enable quantum information processing applications that are insensitive to mechanical decoherence. Control of the dark mode is also utilized to demonstrate all-optical, two-colour switching and interference with light separated by over 5 THz in frequency.
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Affiliation(s)
- David P Lake
- Department of Physics and Astronomy and Institute for Quantum Science and Technology, University of Calgary, Calgary, AB, T2N 1N4, Canada
| | - Matthew Mitchell
- Department of Physics and Astronomy and Institute for Quantum Science and Technology, University of Calgary, Calgary, AB, T2N 1N4, Canada
| | - Barry C Sanders
- Department of Physics and Astronomy and Institute for Quantum Science and Technology, University of Calgary, Calgary, AB, T2N 1N4, Canada
| | - Paul E Barclay
- Department of Physics and Astronomy and Institute for Quantum Science and Technology, University of Calgary, Calgary, AB, T2N 1N4, Canada.
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