scholarly journals Electromagnetically Induced Transparency in Media with Rydberg Excitons 2: Cross-Kerr Modulation

Entropy ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 160 ◽  
Author(s):  
David Ziemkiewicz ◽  
Sylwia Zielińska - Raczyńska
Keyword(s):  
Quantum Information ◽  
Solid State ◽  
Phase Shift ◽  
Cuprous Oxide ◽  
Quantum Information Processing ◽  
Electromagnetically Induced Transparency ◽  
Optimum Conditions ◽  
Third Order ◽  
All Optical ◽  
Induced Transparency

By mapping photons into the sample of cuprous oxide with Rydberg excitons, it is possible to obtain a significant optical phase shift due to third-order cross-Kerr nonlinearities realized under the conditions of electromagnetically induced transparency. The optimum conditions for observation of the phase shift over π in Rydberg excitons media are examined. A discussion of the application of the cross-phase modulations in the field of all-optical quantum information processing in solid-state systems is presented.

scholarly journals Optical π phase shift created with a single-photon pulse

2016 ◽  
Vol 2 (4) ◽  
pp. e1600036 ◽  
Author(s):  
Daniel Tiarks ◽  
Steffen Schmidt ◽  
Gerhard Rempe ◽  
Stephan Dürr
Keyword(s):  
Phase Shift ◽  
Light Pulse ◽  
Light Field ◽  
Quantum Information Processing ◽  
Single Photon ◽  
Electromagnetically Induced Transparency ◽  
Logic Gate ◽  
Quantum Logic Gate ◽  
Photon Pulse ◽  
Induced Transparency

A deterministic photon-photon quantum logic gate is a long-standing goal. Building such a gate becomes possible if a light pulse containing only one photon imprints a phase shift of π onto another light field. We experimentally demonstrate the generation of such a π phase shift with a single-photon pulse. A first light pulse containing less than one photon on average is stored in an atomic gas. Rydberg blockade combined with electromagnetically induced transparency creates a phase shift for a second light pulse, which propagates through the medium. We measure the π phase shift of the second pulse when we postselect the data upon the detection of a retrieved photon from the first pulse. This demonstrates a crucial step toward a photon-photon gate and offers a variety of applications in the field of quantum information processing.

scholarly journals All-optical reversible single-photon isolation at room temperature

2021 ◽  
Vol 7 (12) ◽  
pp. eabe8924
Author(s):  
Ming-Xin Dong ◽  
Ke-Yu Xia ◽  
Wei-Hang Zhang ◽  
Yi-Chen Yu ◽  
Ying-Hao Ye ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Insertion Loss ◽  
High Speed ◽  
Room Temperature ◽  
Quantum Information Processing ◽  
Single Photon ◽  
Electromagnetically Induced Transparency ◽  
All Optical ◽  
On Chip

Nonreciprocal devices operating at the single-photon level are fundamental elements for quantum technologies. Because magneto-optical nonreciprocal devices are incompatible for magnetic-sensitive or on-chip quantum information processing, all-optical nonreciprocal isolation is highly desired, but its realization at the quantum level is yet to be accomplished at room temperature. Here, we propose and experimentally demonstrate two regimes, using electromagnetically induced transparency (EIT) or a Raman transition, for all-optical isolation with warm atoms. We achieve an isolation of 22.52 ± 0.10 dB and an insertion loss of about 1.95 dB for a genuine single photon, with bandwidth up to hundreds of megahertz. The Raman regime realized in the same experimental setup enables us to achieve high isolation and low insertion loss for coherent optical fields with reversed isolation direction. These realizations of single-photon isolation and coherent light isolation at room temperature are promising for simpler reconfiguration of high-speed classical and quantum information processing.

Probing Bloch oscillations using a slow-light sensor

2020 ◽  
Vol 9 (5) ◽  
pp. 243-246
Author(s):  
Pei-Chen Kuan ◽  
Chang Huang ◽  
Shau-Yu Lan
Keyword(s):  
Phase Shift ◽  
Optical Lattice ◽  
Cold Atoms ◽  
Slow Light ◽  
Internal State ◽  
Electromagnetically Induced Transparency ◽  
Bloch Oscillations ◽  
Bloch Oscillation ◽  
Induced Transparency ◽  
Transparency Condition

AbstractWe implement slow-light under electromagnetically induced transparency condition to measure the motion of cold atoms in an optical lattice undergoing Bloch oscillation. The motion of atoms is mapped out through the phase shift of light without perturbing the external and internal state of the atoms. Our results can be used to construct a continuous motional sensor of cold atoms.

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