scholarly journals Enhanced Entanglement in Hybrid Cavity Mediated by a Two-way Coupled Quantum Dot

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 14-23
Author(s):  
Ming-Cui Li ◽  
Ai-Xi Chen
Keyword(s):  
Quantum Dot ◽  
Cavity Mode ◽  
Multipartite Entanglement ◽  
Cavity Field ◽  
Mechanical Resonator ◽  
System A ◽  
Fabry Perot ◽  
Potential Applications ◽  
Cavity System ◽  
Hybrid Cavity

AbstractWe investigate theoretically the entanglement in a hybrid Fabry-Perot cavity system. A membrane in the cavity acts as a mechanical resonator, and a two-level quantum dot is coupled to both the cavity mode and the mechanical resonator. The entanglements between the cavity field and the mechanical resonator, between the mechanical resonator and the quantum dot, as well as between the cavity field and the quantum dot are observed. The logarithmic negativities in the first two subsystems are much larger than those in the system without two-way coupled quantum dot, and the entanglements are robust against the thermal temperature (entanglements still exist in tens of Kelvin). We also find that without direct coupling between the cavity field and the mechanical resonator, one can till observe effective entanglement between them in our system. Our work is helpful and may have potential applications in the research of multipartite entanglement in physical system.

scholarly journals Cavity-enhanced detection of transient absorption signals

2020 ◽  
Vol 238 ◽  
pp. 12003
Author(s):  
Fernanda C. Rodrigues-Machado ◽  
Pauline Pestre ◽  
Liam Scanlon ◽  
Shirin A. Enger ◽  
Jack C. Sankey ◽  
...  
Keyword(s):  
Radiation Dosimetry ◽  
Loss Rate ◽  
Cavity Mode ◽  
Group Delay ◽  
Transient Absorption ◽  
Optical Absorption Measurement ◽  
High Duty Cycle ◽  
Internal Loss ◽  
Fabry Perot ◽  
Potential Applications

We present a simple, high-duty-cycle, cavity-enhanced optical absorption measurement technique based on delay-limited Pound-Drever-Hall (PDH) sideband locking. The chosen circuit naturally provides realtime readout of the amplitude quadrature of the PDH error signal, which can be mapped onto the cavity’s internal loss rate while using the phase quadrature to lock sideband frequency to the cavity mode. Our proofof-concept device comprises a 5-cm-long Fabry-Perot cavity with a 450 kHz bandwidth (finesse 6800, 350 ns power ringdown), and a feedback bandwidth of several MHz, limited primarily by the group delay of our electronics. This technique could readily be applied to other optical resonators such as fiber cavities, with potential applications in radiation dosimetry.

scholarly journals Dynamic properties of InAs∕InP (311)B quantum dot Fabry–Perot lasers emitting at 1.52μm

2008 ◽  
Vol 93 (2) ◽  
pp. 021101 ◽  
Author(s):  
A. Martinez ◽  
K. Merghem ◽  
S. Bouchoule ◽  
G. Moreau ◽  
A. Ramdane ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Dynamic Properties ◽  
Fabry Perot

Dark excitons in a quantum-dot–cavity system under a tilted magnetic field

2017 ◽  
Vol 96 (12) ◽  
Author(s):  
C. A. Jiménez-Orjuela ◽  
H. Vinck-Posada ◽  
José M. Villas-Bôas
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Cavity System ◽  
Tilted Magnetic Field

The coupling of single-photon exciton–biexciton quantum dot and cavity

2017 ◽  
Vol 26 (03) ◽  
pp. 1750029 ◽  
Author(s):  
Lina Jaya Diguna ◽  
Yudi Darma ◽  
Muhammad Danang Birowosuto
Keyword(s):  
Correlation Function ◽  
Quantum Dot ◽  
Density Matrix ◽  
High Probability ◽  
Single Photon ◽  
Photon Emission ◽  
Emission Properties ◽  
Proposed Model ◽  
Cavity System

We investigate the influence of multiple excitons on the photon emission properties of a quantum dot (QD)-cavity system via the master equation for the density matrix. We show that in the intermediate to strong coupling regimes, the multiple excitons lead to the suppressed QD emissions as well as the absence of anti-crossing near zero detuning, arising from the interaction between the multiple excitons and cavity. Furthermore, we analyze the role of the cavity-biexciton detuning in the photon emission properties of cavity and exciton through the second-order correlation function. The small cavity-biexciton detuning yields the significant Purcell effect and the high probability of single photon emissions. The proposed model offers the fundamental approach in developing efficient single-photon emitting devices.

scholarly journals Spin-Mechanical Coupling of an InAs Quantum Dot Embedded in a Mechanical Resonator

2018 ◽  
Vol 121 (24) ◽  
Author(s):  
S. G. Carter ◽  
A. S. Bracker ◽  
G. W. Bryant ◽  
M. Kim ◽  
C. S. Kim ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Mechanical Resonator ◽  
Mechanical Coupling ◽  
Inas Quantum Dot

High power and very low noise operation at 1.3 and 1.5 μm with quantum dot and quantum dash Fabry-Perot lasers for microwave links

2006 ◽  
Author(s):  
Patrick Resneau ◽  
Michel Calligaro ◽  
Michel Krakowski ◽  
Huiyun Liu ◽  
Mark Hopkinson ◽  
...  
Keyword(s):  
Quantum Dot ◽  
High Power ◽  
Low Noise ◽  
Fabry Perot ◽  
Quantum Dash

scholarly journals Boosting Self-interaction of Molecular Vibrations under Ultra-strong Coupling Condition

2021 ◽  
Author(s):  
Akhila Kadyan ◽  
Anil Shaji ◽  
Jino George
Keyword(s):  
Oscillator Strength ◽  
Strong Coupling ◽  
Cavity Mode ◽  
Linear Increase ◽  
Vacuum Field ◽  
New Paradigm ◽  
Coupling Condition ◽  
Field Coupling ◽  
Fabry Perot ◽  
Set Up

In this letter, we investigated the modification of oscillator strength of an asymmetric stretching band of CS<sub>2</sub> by strong coupling to an infrared cavity photon. This is achieved by placing liquid CS<sub>2</sub> in a Fabry-Perot resonator and tune the cavity mode position to match with the molecular vibrational transition. Ultra-strong coupling improves the self-interaction of transition dipoles of asymmetric stretching band of CS<sub>2</sub> that resulted in an increase of its own oscillator strength. We experimentally proved this by taking the area ratio of asymmetric stretching and combination band by selectively coupling the former one. A non-linear increase in the oscillator strength of the asymmetric stretching band is observed upon varying the coupling strength. This is explained by a quantum mechanical model that predicts quadratic behavior under ultra-strong coupling condition. These findings will set up a new paradigm for understanding chemical reaction modification by vacuum field coupling.

A SCHEME FOR IMPLEMENTATION OF DENSE CODING WITH W-CLASS STATES IN CAVITY QED

2009 ◽  
Vol 07 (01) ◽  
pp. 307-312 ◽  
Author(s):  
LIU YE ◽  
JUAN HE
Keyword(s):  
Cavity Qed ◽  
Cavity Mode ◽  
Dense Coding ◽  
Cavity Field ◽  
Quantum Dense Coding ◽  
Atomic States

An experimentally feasible scheme for implementing quantum dense coding in cavity QED is proposed. In the scheme a W-class state can first be prepared by letting the atoms interact simultaneously with a highly detuned cavity mode. Then the states coded on this W-class state can be exactly distinguished by detecting atomic states. The scheme is insensitive to the cavity field, and the quantum dense coding can be realized in a simple way.

Photonic schemes of distribution and reconstruction of an entangled state from hybrid entanglement between polarization and time-bin via quantum dot

2022 ◽  
Author(s):  
Jino Heo ◽  
Seong Gon Choi
Keyword(s):  
Quantum Dot ◽  
Quantum Channel ◽  
Nonlinear Optical ◽  
Optical Devices ◽  
Entangled State ◽  
Experimental Conditions ◽  
Reliable Performance ◽  
Cavity System ◽  
Linear Optical ◽  
Noisy Quantum Channel

Abstract We propose photonic schemes for the distribution and reconstruction of a two-qubit entangled state using a hybrid entangled state under a noisy quantum channel. First, to generate a hybrid entangled state correlated with polarizations and time-bins, we employ a quantum dot (QD)-cavity system (nonlinear optical gate) and linear optical devices to implement controlled operation. These schemes can achieve the distribution and reconstruction of a two-qubit entangled state from hybrid entanglement by utilizing only linear optical devices without a QD-cavity system (i.e., a nonlinear optical device) for users who want to share an entangled state under a noisy quantum channel. For a feasible realization of the proposed schemes, we analyze the interaction between the photons and QD-cavity system and demonstrate the experimental conditions under which the reliable performance of the QD-cavity system is achieved.

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