Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source

AbstractWe demonstrate an on-demand source of microwave single photons with 71–99% intrinsic quantum efficiency. The source is narrowband (300 kHz) and tuneable over a 600 MHz range around 5.2 GHz. Such a device is an important element in numerous quantum technologies and applications. The device consists of a superconducting transmon qubit coupled to the open end of a transmission line. A π-pulse excites the qubit, which subsequently rapidly emits a single photon into the transmission line. A cancellation pulse then suppresses the reflected π-pulse by 33.5 dB, resulting in 0.005 photons leaking into the photon emission channel. We verify strong antibunching of the emitted photon field and determine its Wigner function. Non-radiative decay and 1/f flux noise both affect the quantum efficiency. We also study the device stability over time and identify uncorrelated discrete jumps of the pure dephasing rate at different qubit frequencies on a time scale of hours, which we attribute to independent two-level system defects in the device dielectrics, dispersively coupled to the qubit. Our single-photon source with only one input port is more compact and scalable compared to standard implementations.

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Suppression of multi-photon emission in 1.5-µm quantum-dot single-photon source

2013 International Conference on Indium Phosphide and Related Materials (IPRM) ◽

10.1109/iciprm.2013.6562564 ◽

2013 ◽

Author(s):

Toshiyuki Miyazawa ◽

Kazuya Takemoto ◽

Yoshiki Sakuma ◽

Haizhi Song ◽

Motomu Takatsu ◽

...

Keyword(s):

Quantum Dot ◽

Single Photon ◽

Photon Emission ◽

Single Photon Source ◽

Photon Source

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An Easy-Implemented On-Chip Waveguide Coupled Single Photon Source Based on Self-Assembled Quantum Dots Membrane

Applied Sciences ◽

10.3390/app11020695 ◽

2021 ◽

Vol 11 (2) ◽

pp. 695

Author(s):

Ping Jiang ◽

Na Ma ◽

Peng Liu ◽

Wenxuan Wu ◽

Kai Zhang

Keyword(s):

Quantum Dot ◽

Cross Correlation ◽

Single Photon ◽

Photon Statistics ◽

Single Photons ◽

Single Photon Source ◽

Photonic Circuit ◽

On Chip ◽

Photon Source ◽

Scatter Light

In recent years, many groups and institutions have been committed to the research of integrated quantum photonic circuit technologies, of which the key components are waveguide coupled single photon sources. In this study, we propose an on-chip waveguide-coupled single photon source that is easily implemented as the waveguide is directly made from the quantum dot membrane. In order to scatter light out of the on-chip waveguide plane into the detection apparatus, grating output couplers are made at both ends of the waveguide. The photon statistics of the on-chip photon source were investigated by second-order correlation function g(2)(τ) measurements using a Hanbury Brown and Twiss interferometer. From the spectra and cross-correlation experiments by collecting emission at the point of quantum dot and out coupler, the emitting of single photons from the same quantum dot and propagating via the waveguide to the out couplers was confirmed. These results show that we have achieved an on-chip single photon source that is easily implemented and easily integrated into quantum photonic circuits.

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Scalable integrated single-photon source

Science Advances ◽

10.1126/sciadv.abc8268 ◽

2020 ◽

Vol 6 (50) ◽

pp. eabc8268 ◽

Cited By ~ 1

Author(s):

Ravitej Uppu ◽

Freja T. Pedersen ◽

Ying Wang ◽

Cecilie T. Olesen ◽

Camille Papon ◽

...

Keyword(s):

Quantum Information Processing ◽

Single Photon ◽

Long Strings ◽

High Fidelity ◽

Single Photons ◽

Single Photon Source ◽

Quantum Operations ◽

Main Challenge ◽

On Chip ◽

Photon Source

Photonic qubits are key enablers for quantum information processing deployable across a distributed quantum network. An on-demand and truly scalable source of indistinguishable single photons is the essential component enabling high-fidelity photonic quantum operations. A main challenge is to overcome noise and decoherence processes to reach the steep benchmarks on generation efficiency and photon indistinguishability required for scaling up the source. We report on the realization of a deterministic single-photon source featuring near-unity indistinguishability using a quantum dot in an “on-chip” planar nanophotonic waveguide circuit. The device produces long strings of >100 single photons without any observable decrease in the mutual indistinguishability between photons. A total generation rate of 122 million photons per second is achieved, corresponding to an on-chip source efficiency of 84%. These specifications of the single-photon source are benchmarked for boson sampling and found to enable scaling into the regime of quantum advantage.

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Unambiguous State Discrimination Attack on the B92 Protocol of Quantum Key Distribution with Single Photons

Nonlinear Phenomena in Complex Systems ◽

10.33581/1561-4085-2021-24-3-222-229 ◽

2021 ◽

Vol 24 (3) ◽

Author(s):

D. B. Horoshko ◽

S. Ya. Kilin

Keyword(s):

Quantum Key Distribution ◽

Single Photon ◽

Key Distribution ◽

Single Photons ◽

Single Photon Source ◽

Quantum Cloning ◽

State Discrimination ◽

Photon Source ◽

Unambiguous State Discrimination ◽

B92 Protocol

We consider an unambiguous state discrimination attack on the B92 protocol of quantum key distribution, realized on the basis of polarization encoding of photons produced by a single-photon source. We calculate the secure key rate and the maximal tolerable loss for various overlaps between two signal states employed in this protocol. We make also a comparison with a physically impossible attack of perfect quantum cloning, and show that the unambiguous state discrimination is much more dangerous for the B92 protocol, than this attack, demonstrating thus, that the security of quantum key distribution is not always based on the no-cloning theorem.

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Room-temperature generation of heralded single photons on silicon chip with switchable orbital angular momentum

10.21203/rs.3.rs-1233640/v1 ◽

2022 ◽

Author(s):

Shan Zhang ◽

Xue Feng ◽

Wei Zhang ◽

Kaiyu Cui ◽

Fang Liu ◽

...

Keyword(s):

Angular Momentum ◽

Orbital Angular Momentum ◽

Room Temperature ◽

Quantum Information Processing ◽

Single Photon ◽

High Dimensional ◽

Single Photons ◽

Single Photon Source ◽

Material Systems ◽

Photon Source

Abstract In quantum optics, orbital angular momentum (OAM) is very promising to achieve high-dimensional quantum states due to the nature of infinite and discrete eigenvalues, which is quantized by the topological charge of l. Here, a heralded single-photon source with switchable OAM modes is proposed and demonstrated on silicon chip. At room-temperature, the heralded single photons with 11 OAM modes (l=2~6, -6~-1) have been successfully generated and switched through thermo-optical effect. We believe that such an integrated quantum source with multiple OAM modes and operating at room-temperature would provide a practical platform for high-dimensional quantum information processing. Moreover, our proposed architecture can also be extended to other material systems to further improve the performance of OAM quantum source.

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An all-silicon single-photon source by unconventional photon blockade

Scientific Reports ◽

10.1038/srep11223 ◽

2015 ◽

Vol 5 (1) ◽

Cited By ~ 44

Author(s):

Hugo Flayac ◽

Dario Gerace ◽

Vincenzo Savona

Keyword(s):

Quantum Interference ◽

Light Propagation ◽

Single Photon ◽

Optical Nonlinearity ◽

Single Photons ◽

Single Photon Source ◽

Silicon Based ◽

Photon Source ◽

Unconventional Photon Blockade ◽

Photon Blockade

Abstract The lack of suitable quantum emitters in silicon and silicon-based materials has prevented the realization of room temperature, compact, stable and integrated sources of single photons in a scalable on-chip architecture, so far. Current approaches rely on exploiting the enhanced optical nonlinearity of silicon through light confinement or slow-light propagation and are based on parametric processes that typically require substantial input energy and spatial footprint to reach a reasonable output yield. Here we propose an alternative all-silicon device that employs a different paradigm, namely the interplay between quantum interference and the third-order intrinsic nonlinearity in a system of two coupled optical cavities. This unconventional photon blockade allows to produce antibunched radiation at extremely low input powers. We demonstrate a reliable protocol to operate this mechanism under pulsed optical excitation, as required for device applications, thus implementing a true single-photon source. We finally propose a state-of-art implementation in a standard silicon-based photonic crystal integrated circuit that outperforms existing parametric devices either in input power or footprint area.

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Optical fibre-based single photon source using InAsP quantum dot nanowires and gradient-index lens collection

Scientific Reports ◽

10.1038/s41598-021-02287-y ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

David B. Northeast ◽

Dan Dalacu ◽

John F. Weber ◽

Jason Phoenix ◽

Jean Lapointe ◽

...

Keyword(s):

Quantum Dot ◽

Optical Fibre ◽

Room Temperature ◽

Single Photon ◽

Collection Efficiency ◽

Single Mode ◽

Single Photons ◽

Gradient Index ◽

Single Photon Source ◽

Photon Source

AbstractWe present a compact, fibre-coupled single photon source using gradient-index (GRIN) lenses and an InAsP semiconductor quantum dot embedded within an InP photonic nanowire waveguide. A GRIN lens assembly is used to collect photons close to the tip of the nanowire, coupling the light immediately into a single mode optical fibre. The system provides a stable, high brightness source of fibre-coupled single photons. Using pulsed excitation, we demonstrate on-demand operation with a single photon purity of 98.5% when exciting at saturation in a device with a source-fibre collection efficiency of 35% and an overall single photon collection efficiency of 10%. We also demonstrate “plug and play” operation using room temperature photoluminescence from the InP nanowire for room temperature alignment.

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