Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physical Review A

Spin manipulation by absorption-free optical pumping

Masao Kitano, Keisaku Yamane, T. Ikushima

Published May 1, 1999• 9 citations
Publisher

Abstract

We present an optical pumping scheme by which atomic spin motion can be controlled without photon absorption in the fast pumping limit. The phenomenon can be understood in terms of the quantum Zeno effect and the interaction-free measurement in a spin-photon system.
DOI
10.1103/physreva.59.3710

Related papers

Absorption-free optical control of spin systems: The quantum Zeno effect in optical pumping

Toshihiro Nakanishi, Keisaku Yamane, Masao Kitano

We show that atomic spin motion can be controlled by circularly polarized light without light absorption in the strong pumping limit. In this limit, the pumping light, which drives the empty spin state, destroys the Zeeman coherence effectively and freezes the coherent transition via the quantum Zeno effect. It is verified experimentally that the amount of light absorption decreases asymptotically to zero as the incident light intensity is increased.

arXiv:quant-ph/0103034•Physical Review A•Dec 13, 2001•37 citations

Recent Progress in Quantum Optics. Quantum Zeno Effects in Optics.

Masao Kitano, Keisaku Yamane

The quantum Zeno effect (QZE) is seemingly paradoxical in a sense that an inhibition of transition or a guidance of system can be realized without loss of probability amplitudes in spite of the use of non-unitary processes. But it is quite universal and has been found in various quantum systems as well as in classical wave systems. In this report we will present two examples of QZE in the field of optics . One is theoptical pumping scheme in which atomic spin motion can be controlled without photon absorption in the fast pumping limit. The other example is the light propagation through a series of offset-spliced fibers . Two propagation modes, wave and ray, are possible in optical fibers, and QZE is found to occur only in the former mode.

The Review of Laser Engineering•Jan 1, 2000•0 citations

Optical Measurement and Control of Atomic Spins

Poul Jessen

The spin state of an atomic ensemble can be easily probed and manipulated by optical fields. We explore applications in quantum measurement and control, ranging from spin squeezing in clocks to real-time quantum state tomography.

Frontiers in Optics•Jan 1, 2005•0 citations

Quantum Zeno Blockade for Next Generation Optical Switching in Fiber Systems

Gregory S. Kanter, M. S. Shahriar

Abstract : All-optical switching is crucial for efficient optical communications. The quantum Zeno effect can be used to induce or inhibit optical switching through a variety of processes, all of which share the common characteristic that the evolution of one quantum state into another be inhibited or induced based on the presence or absence of a controllable and continuous quantum measurement. By utilizing this effect, it is the goal of this project to design and construct ultra-low power dissipation, ultra-low volume, fast all-optical switches. In particular, a fundamental limit in existing all-optical switching devices is due to the photon loss resulting from signal-pump coupling. When extended to the quantum domain, this photon loss additionally causes the quantum states of photonic signals to collapse (i.e., decohere). By using the quantum Zeno effect (QZE), it is possible to realize interaction-free switching that eliminates direct signal-pump coupling i.e., QZE for all-optical switching.

•Sep 1, 2013•0 citations

Quantum Optical Control and Measurement in Optomechanics

Gerard J Milburn, Adil A. Gangat

We present schemes that create entanglement between photons and phonons in an optomechanical system. One scheme enables single photon control and novel optomechanical nonlinearities. Another scheme enables quantum-limited readout of phonon jumps.

International Conference on Quantum Information•Jan 1, 2011•0 citations

Interaction-free all-optical switching via the quantum Zeno effect

Y. P. Huang, Joseph B. Altepeter, Prem Kumar

We propose an interaction-free scheme for all-optical switching which does not rely on the physical coupling between signal and control waves. The interaction-free nature of the scheme allows it to overcome the fundamental photon-loss limit imposed by the signal-pump coupling. The same phenomenon protects photonic-signal states from decoherence, making devices based on this scheme suitable for quantum applications. Focusing on $\ensuremath{\chi}{}^{(2)}$ waveguides, we provide device designs for traveling-wave and Fabry-Perot switches. In both designs, the performance is optimal when the signal switching is induced by coherent dynamical evolution. In contrast, when the switching is induced by a rapid dissipation channel, it is less efficient.

arXiv:1008.2408•Physical Review A•Dec 22, 2010•29 citations
The quantum Zeno effect (QZE) is seemingly paradoxical in a sense that an inhibition of transition or a guidance of system can be realized without loss of probability amplitudes in spite of the use of non-unitary processes. But it is quite universal and has been found in various quantum systems as well as in classical wave systems. In this report we will present two examples of QZE in the field of optics . One is theoptical pumping scheme in which atomic spin motion can be controlled without photon absorption in the fast pumping limit. The other example is the light propagation through a series of offset-spliced fibers . Two propagation modes, wave and ray, are possible in optical fibers, and QZE is found to occur only in the former mode.
Abstract : All-optical switching is crucial for efficient optical communications. The quantum Zeno effect can be used to induce or inhibit optical switching through a variety of processes, all of which share the common characteristic that the evolution of one quantum state into another be inhibited or induced based on the presence or absence of a controllable and continuous quantum measurement. By utilizing this effect, it is the goal of this project to design and construct ultra-low power dissipation, ultra-low volume, fast all-optical switches. In particular, a fundamental limit in existing all-optical switching devices is due to the photon loss resulting from signal-pump coupling. When extended to the quantum domain, this photon loss additionally causes the quantum states of photonic signals to collapse (i.e., decohere). By using the quantum Zeno effect (QZE), it is possible to realize interaction-free switching that eliminates direct signal-pump coupling i.e., QZE for all-optical switching.
We propose an interaction-free scheme for all-optical switching which does not rely on the physical coupling between signal and control waves. The interaction-free nature of the scheme allows it to overcome the fundamental photon-loss limit imposed by the signal-pump coupling. The same phenomenon protects photonic-signal states from decoherence, making devices based on this scheme suitable for quantum applications. Focusing on $\ensuremath{\chi}{}^{(2)}$ waveguides, we provide device designs for traveling-wave and Fabry-Perot switches. In both designs, the performance is optimal when the signal switching is induced by coherent dynamical evolution. In contrast, when the switching is induced by a rapid dissipation channel, it is less efficient.