Photon routing based on non-chiral interaction between atoms and waveguides

2021 ◽  
Vol 19 (1) ◽  
pp. 015203
Author(s):  
Wang-Rui Zhang ◽  
Tao Shui ◽  
Yi-Lou Liu ◽  
Ning Ji ◽  
Wen-Xing Yang
Keyword(s):  
Essential Role ◽  
Single Photon ◽  
Real Space ◽  
Input Port ◽  
Quantum Network ◽  
Driving Field ◽  
Chiral Interaction

Abstract The photon router plays an essential role in the optical quantum network. However, conventional routers generally couple photons chirally into waveguides to achieve complete transmission from the input port to the required port. Here, we use non-chiral photon-atom interactions for targeted routing. The system consists of two V-type three-level atoms and two parallel waveguides. In addition, the two atoms are driven by external coherent fields, respectively. With a real-space Hamiltonian, the probability of photon transmitted to four ports can be obtained. The study shows that a single photon input from the left port of the waveguide-a can be deterministically transferred to any of the four ports of the two waveguides by adjusting the detuning of the atom and the driving field on the atom, as well as the distance between the two atoms.

scholarly journals Dynamics of Entanglement between a Quantum Dot Spin Qubit and a Photon Qubit inside a Semiconductor High-Q Nanocavity

2010 ◽  
Vol 2010 ◽  
pp. 1-31 ◽  
Author(s):  
Hubert Pascal Seigneur ◽  
Gabriel Gonzalez ◽  
Michael Niklaus Leuenberger ◽  
Winston Vaughan Schoenfeld
Keyword(s):  
Quantum Dot ◽  
Single Photon ◽  
Hyperfine Interactions ◽  
Interaction Time ◽  
Network Node ◽  
Quantum Network ◽  
Entanglement Dynamics ◽  
High Q ◽  
Spin Qubit

We investigate in this paper the dynamics of entanglement between a QD spin qubit and a single photon qubit inside a quantum network node, as well as its robustness against various decoherence processes. First, the entanglement dynamics is considered without decoherence. In the small detuning regime (Δ=78 μeV), there are three different conditions for maximum entanglement, which occur after 71, 93, and 116 picoseconds of interaction time. In the large detuning regime (Δ=1.5 meV), there is only one peak for maximum entanglement occurring at 625 picoseconds. Second, the entanglement dynamics is considered with decoherence by including the effects of spin-nucleus and hole-nucleus hyperfine interactions. In the small detuning regime, a decent amount of entanglement (35% entanglement) can only be obtained within 200 picoseconds of interaction. Afterward, all entanglement is lost. In the large detuning regime, a smaller amount of entanglement is realized, namely, 25%. And, it lasts only within the first 300 picoseconds.

scholarly journals Fluctuations in the detection of the HOM effect

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Dmitry N. Makarov
Keyword(s):  
Quantum Optics ◽  
Root Mean Square ◽  
Beam Splitter ◽  
Single Photon ◽  
Input Port ◽  
General Mechanism ◽  
Mean Square

AbstractHong-Ou-Mandel (HOM) effect is known to be one of the main phenomena in quantum optics. It is believed that the effect occurs when two identical single-photon waves enter a 1:1 beam splitter, one in each input port. When the photons are identical, they will extinguish each other. In this work, it is shown that these fundamental provisions of the HOM interference may not always be fulfilled. One of the main elements of the HOM interferometer is the beam splitter, which has its own coefficients of reflection $$R = 1/2$$ R = 1 / 2 and transmission $$ T = 1/2 $$ T = 1 / 2 . Here we consider the general mechanism of the interaction of two photons in a beam splitter, which shows that in the HOM theory of the effect it is necessary to know (including when planning the experiment) not only $$ R = 1/2 $$ R = 1 / 2 and $$ T = 1/2 $$ T = 1 / 2 , but also their root-mean-square fluctuations $$ \Delta R ^ 2, \Delta T ^ 2 $$ Δ R 2 , Δ T 2 , which arise due to the dependence of $$R = R(\omega _1, \omega _2) $$ R = R ( ω 1 , ω 2 ) and $$ T = T (\omega _1, \omega _2) $$ T = T ( ω 1 , ω 2 ) on the frequencies where $$\omega _1, \omega _2$$ ω 1 , ω 2 are the frequencies of the first and second photons, respectively. Under certain conditions, specifically when the dependence of the fluctuations $$ \Delta R^2 $$ Δ R 2 and $$ \Delta T^2 $$ Δ T 2 can be neglected and $$ R=T=1/2 $$ R = T = 1 / 2 is chosen, the developed theory coincides with previously known results.

scholarly journals Controlled On-Chip Single-Photon Transfer Using Photonic Crystal Coupled-Cavity Waveguides

2011 ◽  
Vol 2011 ◽  
pp. 1-13 ◽  
Author(s):  
Hubert Pascal Seigneur ◽  
Matthew Weed ◽  
Michael Niklaus Leuenberger ◽  
Winston Vaughan Schoenfeld
Keyword(s):  
High Efficiency ◽  
Nearest Neighbor ◽  
Single Photon ◽  
Tight Binding ◽  
Quantum Mechanical ◽  
Single Photons ◽  
Quantum Network ◽  
On Chip ◽  
Quantum Mechanical Approach ◽  
Coupled Cavity

To the end of realizing a quantum network on-chip, single photons must be guided consistently to their proper destination both on demand and without alteration to the information they carry. Coupled cavity waveguides are anticipated to play a significant role in this regard for two important reasons. First, these structures can easily be included within fully quantum-mechanical models using the phenomenological description of the tight-binding Hamiltonian, which is simply written down in the basis of creation and annihilation operators that move photons from one quasimode to another. This allows for a deeper understanding of the underlying physics and the identification and characterization of features that are truly critical to the behavior of the quantum network using only a few parameters. Second, their unique dispersive properties together with the careful engineering of the dynamic coupling between nearest neighbor cavities provide the necessary control for high-efficiency single-photon on-chip transfer. In this publication, we report transfer efficiencies in the upwards of 93% with respect to a fully quantum-mechanical approach and unprecedented 77% in terms of transferring the energy density contained in a classical quasibound mode from one cavity to another.

Few-photon routing via chiral light-matter couplings

2021 ◽  
Author(s):  
Ya Yang ◽  
Jing Lu ◽  
Lan Zhou
Keyword(s):  
Quantum Channel ◽  
Active Element ◽  
Single Photon ◽  
Essential Elements ◽  
Quantum Network ◽  
Photon Scattering ◽  
Output State ◽  
Two Photon ◽  
Quantum Router ◽  
The One

Abstract Quantum router is one of the essential elements in the quantum network. Conventional routers only direct a single photon from one quantum channel into another. Here, we proposed a few-photon router. The active element of the router is a single qubit chirally coupled to two independent waveguides simultaneously, where each waveguide mode provides a quantum channel. By introducing the operators of the scatter-free space and the controllable space, the output state of the one-photon and two-photon scattering are derived analytically. It is found that the qubit can direct one and two photons from one port of the incident waveguide to an arbitrarily selected port of the other waveguide with unity, respectively. However, two photons cannot be simultaneously routed to the same port due to the anti-bunch effect.

scholarly journals A controllable single photon beam-splitter as a node of a quantum network

2016 ◽  
Vol 49 (6) ◽  
pp. 065502
Author(s):  
Gaurav Gautam ◽  
Santosh Kumar ◽  
Saikat Ghosh ◽  
Deepak Kumar
Keyword(s):  
Beam Splitter ◽  
Single Photon ◽  
Photon Beam ◽  
Quantum Network

scholarly journals Quantum walks and wavepacket dynamics on a lattice with twisted photons

2015 ◽  
Vol 1 (2) ◽  
pp. e1500087 ◽  
Author(s):  
Filippo Cardano ◽  
Francesco Massa ◽  
Hammam Qassim ◽  
Ebrahim Karimi ◽  
Sergei Slussarenko ◽  
...  
Keyword(s):  
Momentum Space ◽  
Quantum Dynamics ◽  
Single Photon ◽  
Quantum Walk ◽  
Real Space ◽  
Quantum Walks ◽  
Experimental Realization ◽  
Whole Process ◽  
Topological Features ◽  
Superposition States

The “quantum walk” has emerged recently as a paradigmatic process for the dynamic simulation of complex quantum systems, entanglement production and quantum computation. Hitherto, photonic implementations of quantum walks have mainly been based on multipath interferometric schemes in real space. We report the experimental realization of a discrete quantum walk taking place in the orbital angular momentum space of light, both for a single photon and for two simultaneous photons. In contrast to previous implementations, the whole process develops in a single light beam, with no need of interferometers; it requires optical resources scaling linearly with the number of steps; and it allows flexible control of input and output superposition states. Exploiting the latter property, we explored the system band structure in momentum space and the associated spin-orbit topological features by simulating the quantum dynamics of Gaussian wavepackets. Our demonstration introduces a novel versatile photonic platform for quantum simulations.

scholarly journals Bandwidth-Tunable Single-Photon Source in an Ion-Trap Quantum Network

2009 ◽  
Vol 103 (21) ◽  
Author(s):  
M. Almendros ◽  
J. Huwer ◽  
N. Piro ◽  
F. Rohde ◽  
C. Schuck ◽  
...  
Keyword(s):  
Ion Trap ◽  
Single Photon ◽  
Quantum Network ◽  
Single Photon Source ◽  
Photon Source

scholarly journals Investigation of the Time Behavior of the Second-Order Coherence Function of a Tunable Single-Photon Source

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Azadeh Ahmadian ◽  
Rasoul Malekfar
Keyword(s):  
Master Equation ◽  
Single Photon ◽  
Coherence Function ◽  
Second Order ◽  
The State ◽  
Time Behavior ◽  
Quantum Network ◽  
Single Photon Source ◽  
Photon Sources ◽  
Photon Source

Single-photon sources are critical optical components in quantum communication, in particular, for security applications. One of the essential parameters that define these sources is the magnitude of the second-order coherence function, whose investigation reveals the state of the emitted photon. In this study, we indicate that the second-order coherence function varies over time when using two lasers and preparing coherent population trapping. The calculation is based on solving the master equation to find the density matrix corresponding to the emission dynamics and provide the second-order coherence function. The changes of the second-order coherence function can be estimated and the system behavior regarding photon emission can be predicted by solving the master equation based on the parameters obtained from the experimental results of a nitrogen vacancy (NV) in a diamond. Here we report, for the first time to the best of our knowledge, that the state of the emitted photons persists in the strong interaction of the aforementioned process. As using two lasers is a familiar method for controlling the single-photon source and the stability of the source is an essential point in a quantum network, this study can be considered to develop quantum network components such as memory and on-demand single-photon sources. Also, it suggests a method for tuning photon statistics while controlling the photon states.

Single Photon Source for an Ion Trap Quantum Network

2009 ◽  
Author(s):  
Marc Almendros ◽  
Felix Rohde ◽  
Carsten Schuck ◽  
Jan Huwer ◽  
Nicolas Piro ◽  
...  
Keyword(s):  
Ion Trap ◽  
Single Photon ◽  
Quantum Network ◽  
Single Photon Source ◽  
Photon Source
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