DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Superradiance and Subradiance due to Quantum Interference of Entangled Free Electrons

Journal Article · · Physical Review Letters

When multiple quantum emitters radiate, their emission rate may be enhanced or suppressed due to collective interference in a process known as super- or subradiance. Such processes are well known to occur also in light emission from free electrons, known as coherent cathodoluminescence. Unlike atomic systems, free electrons have an unbounded energy spectrum, and, thus, all their emission mechanisms rely on electron recoil, in addition to the classical properties of the dielectric medium. To date, all experimental and theoretical studies of super- and subradiance from free electrons assumed only classical correlations between particles. However, dependence on quantum correlations, such as entanglement between free electrons, has not been studied. Recent advances in coherent shaping of free-electron wave functions motivate the investigation of such quantum regimes of super- and subradiance. In this Letter, we show how a pair of coincident path-entangled electrons can demonstrate either super- or subradiant light emission, depending on the two-particle wave function. By choosing different free-electron Bell states, the spectrum and emission pattern of the light can be reshaped, in a manner that cannot be accounted for by a classical mixed state. We show these results for light emission in any optical medium and discuss their generalization to many-body quantum states. Furthermore, our findings suggest that light emission can be sensitive to the explicit quantum state of the emitting matter wave and possibly serve as a nondestructive measurement scheme for measuring the quantum state of many-body systems.

Research Organization:
Krell Institute, Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-97ER25308
OSTI ID:
1850151
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 127; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (72)

Free‐Electron Qubits journal December 2020
Superradiance: An essay on the theory of collective spontaneous emission journal December 1982
Principles of Nano-Optics book January 2006
Optical Excitations with Electron Beams: Challenges and Opportunities journal March 2021
Single-Photon Generation by Electron Beams journal December 2011
Free fermion antibunching in a degenerate atomic Fermi gas released from an optical lattice journal December 2006
Photon-induced near-field electron microscopy journal December 2009
Attosecond control of electrons emitted from a nanoscale metal tip journal July 2011
Quantum coherent optical phase modulation in an ultrafast transmission electron microscope journal May 2015
Giant photon bunching, superradiant pulse emission and excitation trapping in quantum-dot nanolasers journal May 2016
Efficient plasmonic emission by the quantum Čerenkov effect from hot carriers in graphene journal June 2016
X-ray free-electron lasers journal November 2010
Beating the shot-noise limit journal October 2012
Ramsey-type phase control of free-electron beams journal August 2016
Superradiance of quantum dots journal January 2007
Super-radiance reveals infinite-range dipole interactions through a nanofiber journal November 2017
Towards integrated tunable all-silicon free-electron light sources journal July 2019
Control of quantum electrodynamical processes by shaping electron wavepackets journal March 2021
Electron-beam spectroscopy for nanophotonics journal July 2019
Attosecond electron pulse trains and quantum state reconstruction in ultrafast transmission electron microscopy journal November 2017
Quantum optical microcombs journal February 2019
Tunable free-electron X-ray radiation from van der Waals materials journal September 2020
Resonant phase-matching between a light wave and a free-electron wavefunction journal October 2020
Controlling free electrons with optical whispering-gallery modes journal June 2020
Coherent interaction between free electrons and a photonic cavity journal June 2020
Light–matter interactions with photonic quasiparticles journal September 2020
Coherent and spontaneous emission in the quantum free electron laser journal July 2012
Electron holography—basics and applications journal December 2007
What defines the quantum regime of the free-electron laser? journal December 2015
Coherence in Spontaneous Radiation Processes journal January 1954
Multiparticle coherence calculations for synchrotron-radiation emission journal July 1991
Two-color bright squeezed vacuum journal July 2010
Single-photon router: Coherent control of multichannel scattering for single photons with quantum interferences journal January 2014
Master equation for collective spontaneous emission with quantized atomic motion journal February 2016
Cooperative spontaneous emission from indistinguishable atoms in arbitrary motional quantum states journal September 2016
Spectral and spatial shaping of Smith-Purcell radiation journal December 2017
Spontaneous and stimulated emissions of a preformed quantum free-electron wave function journal May 2019
High-gain quantum free-electron laser: Emergence and exponential gain journal May 2019
Observation of Narrow-Band Terahertz Coherent Cherenkov Radiation from a Cylindrical Dielectric-Lined Waveguide journal August 2009
Light Well: A Tunable Free-Electron Light Source on a Chip journal September 2009
Spin-to-Orbital Angular Momentum Conversion and Spin-Polarization Filtering in Electron Beams journal January 2012
Controlled Dicke Subradiance from a Large Cloud of Two-Level Systems journal March 2012
Observation of Shot Noise Suppression at Optical Wavelengths in a Relativistic Electron Beam journal July 2012
Superradiance for Atoms Trapped along a Photonic Crystal Waveguide journal August 2015
Subradiance in a Large Cloud of Cold Atoms journal February 2016
Two-Particle Interference of Electron Pairs on a Molecular Level journal August 2016
Quantum Limitation to the Coherent Emission of Accelerated Charges journal July 2018
Observing the Quantum Wave Nature of Free Electrons through Spontaneous Emission journal August 2019
Entanglements of Electrons and Cavity Photons in the Strong-Coupling Regime journal September 2019
Free-Electron–Bound-Electron Resonant Interaction journal February 2020
Quantum Entanglement and Modulation Enhancement of Free-Electron–Bound-Electron Interaction journal June 2021
Toward Atomic-Resolution Quantum Measurements with Coherently Shaped Free Electrons journal June 2021
Quantum Wave-Particle Duality in Free-Electron–Bound-Electron Interaction journal June 2021
Observation of Superradiant and Subradiant Spontaneous Emission of Two Trapped Ions journal March 1996
Observation of Frequency-Locked Coherent Terahertz Smith-Purcell Radiation journal February 2005
Bogoliubov-Čerenkov Radiation in a Bose-Einstein Condensate Flowing against an Obstacle journal December 2006
Subradiant spontaneous undulator emission through collective suppression of shot noise journal May 2015
Optical excitations in electron microscopy journal February 2010
The physics of x-ray free-electron lasers journal March 2016
Linac Coherent Light Source: The first five years journal March 2016
Superradiant and stimulated-superradiant emission of bunched electron beams journal August 2019
Shaping quantum photonic states using free electrons journal March 2021
Optical coherence transfer mediated by free electrons journal April 2021
The coherence of light is fundamentally tied to the quantum coherence of the emitting particle journal April 2021
The Simplest Double Slit: Interference and Entanglement in Double Photoionization of H2 journal November 2007
Nondestructive Detection of an Optical Photon journal November 2013
Quantum correlations in electron microscopy journal January 2021
Free-electron shaping using quantum light journal January 2020
Probing quantum optical excitations with fast electrons journal January 2019
Macroscopic quantum electrodynamics - Concepts and applications journal October 2008
Superradiance: the principles of generation and implementation in lasers journal April 2017
Probing quantum optical excitations with fast electrons collection January 2019