QUANTUM SECURE DIRECT COMMUNICATION WITH ONLY SEPARATE MEASUREMENTS IN DRIVEN CAVITY QED

2010 ◽  
Vol 08 (03) ◽  
pp. 457-464
Author(s):  
CHUAN-JIA SHAN ◽  
TAO CHEN ◽  
JI-BING LIU ◽  
TANG-KUN LIU ◽  
YAN-XIA HUANG ◽  
...  
Keyword(s):  
Quantum Electrodynamics ◽  
Cavity Qed ◽  
Resonant Cavity ◽  
Bell State ◽  
Quantum Secure Direct Communication ◽  
Single Mode ◽  
Cavity Quantum Electrodynamics ◽  
Direct Communication ◽  
Legitimate User ◽  
Communication Processes

An experimentally feasible new scheme for quantum secure direct communication is proposed in cavity quantum electrodynamics without apparent joint Bell-state measurement. The legitimate user can receive different secret messages in a direct way through Einstein–Podolsky–Rosen (EPR) pairs, the probability of the success in our scheme is unity. In the communication processes, the interactions between atoms and a single-mode non-resonant cavity with the assistance of a strong classical driving field substitute the joint measurements. Hence, this scheme needs only separate measurements. In addition, the scheme is insensitive to the cavity decay and the thermal field. The discussion of the scheme indicates that it can be realized based on current technologies.

BIDIRECTIONAL QUANTUM SECURE DIRECT COMMUNICATION IN DRIVEN CAVITY QED

2009 ◽  
Vol 23 (27) ◽  
pp. 3225-3234 ◽  
Author(s):  
CHUAN-JIA SHAN ◽  
JI-BING LIU ◽  
WEI-WEN CHENG ◽  
TANG-KUN LIU ◽  
YAN-XIA HUANG ◽  
...  
Keyword(s):  
Cavity Qed ◽  
Thermal Field ◽  
Success Probability ◽  
Bell State ◽  
Quantum Secure Direct Communication ◽  
Entanglement Swapping ◽  
Direct Communication ◽  
Driven Cavity ◽  
Cavity Decay ◽  
Probability Of Success

A theoretical scheme of bidirectional quantum secure direct communication is proposed in the context of driven cavity QED. We first present an entanglement swapping scheme in cavities where two atoms without previous interaction can be entangled with a success probability of unity. Then, based on a novel property of entanglement swapping, we propose a bidirectional quantum secure direct communication protocol, in which two legitimate users can exchange their different secret messages simultaneously in a direct way. The probability of success in our scheme is 1.0. This scheme does not involve apparent (or direct) Bell-state measurements and is insensitive to the cavity decay and the thermal field.

TELEPORTATION WITHOUT JOINT MEASUREMENT IN CAVITY QED

2006 ◽  
Vol 20 (19) ◽  
pp. 1183-1189
Author(s):  
ZHENG-YUAN XUE ◽  
YOU-MIN YI ◽  
ZHUO-LIANG CAO
Keyword(s):  
Quantum Electrodynamics ◽  
Cavity Qed ◽  
Cavity Mode ◽  
Bell State ◽  
Cavity Quantum Electrodynamics ◽  
Atomic State ◽  
Joint Measurement ◽  
Bell State Measurement ◽  
State Measurement

Schemes for the teleporting of the cavity mode state and the unknown atomic state are proposed in cavity quantum electrodynamics (QED) without joint Bell-state measurement (BSM). The presented schemes are implemented with separate atomic measurements instead of any type of joint measurement. The discussion of the scheme indicates that it can be realized by current technologies.

TWO-PHOTON NONLINEAR INTERACTION MEDIATED BY CAVITY QUANTUM ELECTRODYNAMICS SYSTEMS

2006 ◽  
Vol 20 (18) ◽  
pp. 2451-2490 ◽  
Author(s):  
KAZUKI KOSHINO ◽  
HAJIME ISHIHARA
Keyword(s):  
Quantum Electrodynamics ◽  
Cavity Qed ◽  
Shape Control ◽  
Single Mode ◽  
Optical Nonlinearity ◽  
Cavity Quantum Electrodynamics ◽  
Recent Analysis ◽  
Space Representation ◽  
Two Photon ◽  
Field Amplification

Exploiting the field-amplification effect of a cavity, the possibility of optical nonlinearity by only two photons was indicated experimentally. In the present article, we review our recent analysis of the two-photon dynamics in a cavity quantum electrodynamics (QED) system. Since a cavity-QED system is highly dispersive around its resonances, the shapes of photonic pulses are significantly deformed through interaction with the system. Thus, the present analysis is based on a formalism beyond single-mode approximations. The external photon field is treated rigorously as a continuum, which enables us to handle the two-photon wavefunction in the space representation. The degree of optical nonlinearity in a two-photon state is quantified by comparing the output wavefunction with the linear output wavefunction. It is revealed that the semiclassical optical response theory can be applied for evaluation of the two-photon optical nonlinearity. The two-photon nonlinearity appears not purely as a phase shift in the output wavefunction. The degradation of the fidelity between the output wavefunction and the linear output wavefunction always occurs, which hinders the application of this nonlinear effect as a quantum phase gate. The optimum condition for maximizing the two-photon nonlinearity is clarified, suggesting that pulse shape control is more essential than the Q-value control of the cavity QED system.

scholarly journals Quantum optics and cavity QED with quantum dots in photonic crystals

2017 ◽  
Author(s):  
Jelena Vučković
Keyword(s):  
Quantum Dots ◽  
Information Processing ◽  
Quantum Information ◽  
Quantum Optics ◽  
Quantum Electrodynamics ◽  
Cavity Qed ◽  
Cavity Quantum Electrodynamics ◽  
Test Bed ◽  
Matter Interaction ◽  
Light Matter Interaction

Quantum dots in optical nanocavities are interesting as a test-bed for fundamental studies of light–matter interaction (cavity quantum electrodynamics, QED), as well as an integrated platform for information processing. As a result of the strong field localization inside sub-cubic-wavelength volumes, these dots enable very large emitter–field interaction strengths. In addition to their use in the study of new regimes of cavity QED, they can also be employed to build devices for quantum information processing, such as ultrafast quantum gates, non-classical light sources, and spin–photon interfaces. Beside quantum information systems, many classical information processing devices, such as lasers and modulators, benefit greatly from the enhanced light–matter interaction in such structures. This chapter gives an introduction to quantum dots, photonic crystal resonators, cavity QED, and quantum optics on this platform, as well as possible device applications.

CAVITY QUANTUM ELECTRODYNAMICS OF COMPETING ONE AND TWO PHOTON PROCESSES

1996 ◽  
Vol 10 (09) ◽  
pp. 385-391
Author(s):  
AMITABH JOSHI
Keyword(s):  
Electromagnetic Field ◽  
Quantum Electrodynamics ◽  
Dynamical Evolution ◽  
Single Mode ◽  
Cavity Quantum Electrodynamics ◽  
Rabi Splitting ◽  
New Model ◽  
Two Photon ◽  
Photon Transition ◽  
Vacuum Rabi Splitting

We consider a new model of cavity quantum electrodynamics consisting of the interaction of a single mode of electromagnetic field with two non-identical two-level atoms undergoing one and two photon transition respectively in an ideal cavity. The exact analytic results for the vacuum Rabi splitting and the dynamical evolution of the model are given.

A SCHEME FOR QUANTUM DENSE CODING IN CAVITY QED

2011 ◽  
Vol 25 (32) ◽  
pp. 4679-4685
Author(s):  
CHANG-LIN ZOU ◽  
ZHUO-LIANG CAO
Keyword(s):  
Quantum Mechanics ◽  
Quantum State ◽  
Quantum Electrodynamics ◽  
Cavity Qed ◽  
Cavity Quantum Electrodynamics ◽  
Quantum Nonlocality ◽  
Dense Coding ◽  
Quantum Dense Coding ◽  
Current Technology

Quantum mechanics allows one to encode the information in the superposition of a quantum state which embodies the nature of quantum nonlocality. Here we propose a realizable physical scheme for a multiparticle quantum dense coding (QDC) between two users in cavity quantum electrodynamics (QED). We also discuss the feasibility of our scheme within current technology.

scholarly journals An inhibited laser

2021 ◽  
Author(s):  
Tiantian Shi ◽  
Duo Pan ◽  
Jingbiao Chen
Keyword(s):  
Quantum Electrodynamics ◽  
Resonant Cavity ◽  
Cavity Quantum Electrodynamics ◽  
Stimulated Emission ◽  
Optical Clock ◽  
Spontaneous Radiation ◽  
Integer Multiple ◽  
Cavity Resonances ◽  
Further Development ◽  
Active Optical Clock

Abstract Traditional lasers function using resonant cavities, in which the round-trip optical path is exactly equal to an integer multiple of the intracavity wavelengths to constructively enhance the spontaneous emission rate. By taking advantage of the resonant cavity enhancement, the narrowest sub-10-mHz-linewidth laser and a 10^-16-fractional-frequency-stability superradiant active optical clock (AOC) have been achieved. However, never has a laser with atomic spontaneous radiation being destructively inhibited in an anti-resonant cavity where the atomic resonance is exactly between two adjacent cavity resonances been proven. Herein, we present the first demonstration of the inhibited stimulated emission, which is termed an inhibited laser. Compared with traditional superradiant AOCs exhibiting superiority for the high suppression of cavity noise in lasers, the effect of cavity pulling on the inhibited laser's frequency can be further suppressed by a factor of (2F/π)^2. This study of the inhibited laser will guide further development of superradiant AOCs with better stability, and may lead to new searches in the cavity quantum electrodynamics (QED) field.

Controlled Quantum Secure Direct Communication with Local Separate Measurements in Cavity QED

2009 ◽  
Vol 49 (2) ◽  
pp. 334-342 ◽  
Author(s):  
Chuan-Jia Shan ◽  
Ji-Bing Liu ◽  
Tao Chen ◽  
Tang-Kun Liu ◽  
Yan-Xia Huang ◽  
...  
Keyword(s):  
Cavity Qed ◽  
Quantum Secure Direct Communication ◽  
Direct Communication
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