Two-photon interference in an atom–quantum dot hybrid system

Vural, Hüseyin; Portalupi, Simone Luca; Maisch, Julian; Kern, Simon; Weber, Jonas H.; Jetter, Michael; Wrachtrup, Jörg; Löw, Robert; Gerhardt, Ilja; Michler, Peter

doi:10.1364/optica.5.000367

Cited by 42 publications

(51 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The group velocity inside a medium of group index

n_{g} = n^{'} + ω d n^{'} / d ω

is known to be given as

c_{g} = c / n_{g}

. When the group index is larger than unity “slow light” can be observed, while for an index below unity “fast light” is expected …”

Section: Theorymentioning

confidence: 99%

“…The resulting delay is represented by an integration of the individual delays over the entire spectrum and is generally more complex than in the monochromatic case . When this is mathematically estimated it becomes clear that a) the longer the delay, the longer a light pulse is delayed and the more it smears out, b) these characteristic fingerprints can be observed and the pulse shape is affected in a non‐trivial way …”

Section: Theorymentioning

confidence: 99%

“…Aim of the simulation is to obtain the respective shapes after propagation through the atomic medium. The calculations assume a random‐walk model of the spectral position of the quantum dot . Due to fluctuations of the electric and magnetic field in the environment of a QD its energy levels shift randomly—an effect which is often described as spectral diffusion.…”

Section: Theorymentioning

confidence: 99%

“…For example, it has been shown that photon propagation near atomic transitions can result in an observable photonic delay. First results with laser pulses have set the basis for more recent experiments where single photons were slowed down within alkali vapors . These experiments showed the potential of implementing a hybrid quantum system combining single photons from quantum dots with their atomic counterparts.…”

Section: Introductionmentioning

confidence: 99%

“…Here we report on the experimental implementation of a fine‐tunable delay with simultaneous photonic routing in a hot atomic cesium vapor. While the control of the vapor temperature allows for reaching high values of photonic delay the simultaneous use of a magnetic field results in a faster and more reliable knob for controlling the photon arrival time. Controlling precisely this property is of relevance when performing two‐photon interference, that is, the basic building block of quantum operations, where the arrival time of the photons on the beamsplitter needs to be precisely synchronized.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Controllable Delay and Polarization Routing of Single Photons

et al. 2019

Self Cite

View full text Add to dashboard Cite

Full control of single photons is important in quantum information and quantum networking. In particular, controlling the photon–atom interaction can be an appealing means to realize more complex quantum experiments. As a matter of example, the storage of photons into atomic media represents one key approach to memory‐assisted quantum communication and computing. Here it is shown that the propagation of single photons from a semiconductor quantum dot can be deliberately controlled by an atomic vapor under the application of an external magnetic field. The present results enable the use of an atomic vapor as a precise and reliable wavelength selective delay and allows for routing the single photons according to their polarization and the external magnetic field. With an overall delay of 25 ns, it is possible to fine‐tune the arrival time of the photons by more than 600 ps which matches the scale of the quantum dot's lifetime. The experimental data are fully reproduced by a theoretical model.

show abstract

“…The group velocity inside a medium of group index

n_{g} = n^{'} + ω d n^{'} / d ω

is known to be given as

c_{g} = c / n_{g}

. When the group index is larger than unity “slow light” can be observed, while for an index below unity “fast light” is expected …”

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Controllable Delay and Polarization Routing of Single Photons

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

Semiconductor Quantum Dots for Integrated Quantum Photonics

et al. 2019

Self Cite

View full text Add to dashboard Cite

Quantum mechanics promises to have a strong impact on many aspects of research and technology, improving classical analogues via purely quantum effects. A large variety of tasks are currently under investigation, for example, the implementation of quantum computing, sensing, metrology, and communication. From a general perspective, in a similar way as classical computing benefited by the reduction of the device footprint, enabling the realization of highly complex chips, a range of quantum applications will sensibly improve thanks to the successful realization of on-chip quantum photonics. Conversely to bulky table-top experiments, it would be very advantageous to transfer all required functionalities on the same quantum photonic chip. The key elements for quantum photonic circuits are on-demand nonclassical light sources, a versatile photonic logic, the ability to store quantum information, and highly efficient detectors, directly integrated on-chip. Among several systems capable of the efficient generation of singleand indistinguishable photons, quantum dots are rapidly establishing as one of the most appealing candidates. This paper reviews the recent progress in the on-chip integration of quantum-dot-based nonclassical light sources as well as in the development of the main building blocks, either integrated monolithically or hybridly on a compact and scalable platform. IntroductionFrom the foundation of quantum mechanics in the early 20th century to explain fundamental physical observations, over the development of transistors and lasers in the 1950s and 1960s, the second quantum revolution is now in full swing. The driving force behind this continuing "quantum footrace" are quantum mechanical effects based on superposition and entanglement that can lead to profound changes. Especially in the field of quantum information science, dramatic improvements are expected in terms of increased computational speed and communication security if compared with classical counterparts.Talking about quantum supremacy, two problems-Grover's algorithm for the efficient search in large unsorted databases and Shor's algorithm for the prime factorization of large integers-are frequently mentioned. [1][2][3] Grover's quantum search algorithm can find an element of a search space M in O( √ M) operations compared to the best known classical algorithms approximately requiring O(M) steps. [4] Shor's algorithm can prime factorize large integers with N bits in polynomial speed compared to the exponential scaling of classical algorithms. Currently, several cryptography schemes in electronic communication systems rely on the difficulty of prime factorization as its security method. Consequently, a quantum computer could break the cryptographic keys quickly by calculating or searching exhaustively all key possibilities, which may allow an eavesdropper to intercept the communication channel. [5] However, quantum key distribution schemes can be alternatively used, which are based on the secure exchange of a cryptographic key between remote...

show abstract

Cesium‐Vapor‐Based Delay of Single Photons Emitted by Deterministically Fabricated Quantum Dot Microlenses

et al. 2019

View full text Add to dashboard Cite

Quantum light sources are key building blocks of photonic quantum technologies. For many applications, it is of interest to control the arrival time of single photons emitted by such quantum devices, or even to store single photons in quantum memories. In situ electron beam lithography is applied to realize InGaAs quantum dot (QD)‐based single‐photon sources, which are interfaced with cesium (Cs) vapor to control the time delay of emitted photons. Via numerical simulations of the light–matter interaction in realistic QD‐Cs‐vapor configurations, the influence of the vapor temperature and spectral QD‐atom detuning is explored to maximize the achievable delay in experimental studies. As a result, this hybrid quantum system allows to trigger the emission of single photons with a linewidth as low as 1.54 GHz even under non‐resonant optical excitation and to delay the emission pulses by up to (15.71 ± 0.01) ns for an effective cell length of 150 mm. This work can pave the way for scalable quantum systems relying on a well‐controlled delay of single photons on a time scale of up to a few tens of nanoseconds.

show abstract

Two-photon interference in an atom–quantum dot hybrid system

Cited by 42 publications

References 42 publications

Controllable Delay and Polarization Routing of Single Photons

Controllable Delay and Polarization Routing of Single Photons

Semiconductor Quantum Dots for Integrated Quantum Photonics

Cesium‐Vapor‐Based Delay of Single Photons Emitted by Deterministically Fabricated Quantum Dot Microlenses

Contact Info

Product

Resources

About