Joint Characterization of Two Single Photon Detectors with a Fiber-based Source of Entangled Photon Pairs

Jones, D. E.; Kirby, Brian T.; Brodsky, Michael

doi:10.1364/fio.2017.jw4a.37

Cited by 4 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this experiment, we use ITU channel 28 (192.8THz) for quantum channel A and ITU channel 34 (193.4THz) for quantum channel B. The average number of generated photon pairs per pulse μ is tunable in the 0.001 -0.1 range [35,36]. Upon passing through quantum channels A and B, each photon reaches a detector station consisting of a polarization analyzer (PA) and an InGaAs single photon detector (SPD).…”

Section: Methodsmentioning

confidence: 99%

Tuning quantum channels to maximize polarization entanglement for telecom photon pairs

2018

View full text Add to dashboard Cite

Quantum networks entangle remote nodes by distributing quantum states, which inevitably suffer from decoherence while traversing quantum channels. Pertinent decoherence mechanisms govern the channel capacity, its reach, and the quality and rate of distributed entanglement. Hence recognizing, understanding, and modeling those mechanisms is a crucial step in building quantum networks. Here, we study practical fiber-optic quantum channels that partially filter individual modes of transmitted polarization entangled states and are capable of introducing dephasing. First, we theoretically model and experimentally demonstrate the combined effect of two independent and arbitrarily oriented polarization dependent loss elements experienced by each photon of an entangled photon pair. Then, we showcase the compensation of lost entanglement by properly adjusting the channels' properties and discuss the resulting tradeoff between the entanglement quality and rate. Our results provide insights into the capacity of practical fiber-optics channels, thus taking an important step towards the realization of quantum networks.

show abstract

Section: Methodsmentioning

confidence: 99%

Tuning quantum channels to maximize polarization entanglement for telecom photon pairs

2018

View full text Add to dashboard Cite

show abstract

“…The DSF is arranged in the Sagnac configuration using a polarization beam splitter (PBS), and a WDM demux placed at the output of the Sagnac loop filters out the pump and separates photons spectrally into 100 GHz-spaced ITU outputs [32]. The average number of generated photon pairs per pulse is tunable within a range of 0.001 − 0.1 [33], [34]. Detector stations consisting of a polarization analyzer (PA) and an InGaAs single photon detector (SPD) detect photons at the output of channels A and B.…”

Section: Methodsmentioning

confidence: 99%

Effect of Polarization Dependent Loss on the Quality of Transmitted Polarization Entanglement

Kirby

Jones

Brodsky

2019

J. Lightwave Technol.

View full text Add to dashboard Cite

Quantum networking brings together several diverse research areas, such as fiber-optic communication, quantum optics, and quantum information, to achieve capabilities in security, secret sharing, and authentication which are unavailable classically. The development of practical fiber-based quantum networks requires an understanding of the reach, rates, and quality of the entanglement of distributed quantum states. Here, we present a theoretical model describing how the magnitude and orientation of polarization dependent loss (PDL), a common impairment in fiber-optic networks, affects the entanglement quality of distributed quantum states. Furthermore, we theoretically characterize how PDL in one fiber channel can be optimally applied in order to nonlocally compensate for the PDL present in another channel. We present experimental results that verify our theoretical model. Index Terms-Optical fiber communication, quantum entanglement. I. INTRODUCTION Q UANTUM networks promise to offer functionalities unavailable classically by using distributed quantum entanglement as a resource [1]. Essential to the development of a quantum network is the ability to create, manipulate, and distribute entanglement between distant nodes [2]. It would be desirable to leverage the vast deployed fiber optics infrastructure for entanglement distribution. However, entanglement is fragile, and a greater understanding of how transmission through fibers and fiber components affects entanglement quality is required in order to successfully develop a fiber-based quantum network. Specifically, for the distribution of polarization-entangled states, polarization mode dispersion (PMD) and polarization dependent loss (PDL) are the two principal effects which must be accounted for [3]-[5]. While the PDL of the fibers itself is often low, PDL is commonly found in optical components, such as isolators, multiplexers, and couplers, where the attenuations of the two orthogonal polarization modes can differ. The effects of PDL in classical communication have been thoroughly investigated over the

show abstract

“…The results of a calculation of the fidelity are plotted in fig. 6 as a function of the detector efficiency  for a constant PDL of 3dB and photons per time step to coincide with the dark-count rate of the detectors of reference [21]. For reference, we have also included vertical lines in fig.…”

Section: Correction With Imperfect Detectorsmentioning

confidence: 99%

“…The vertical lines correspond to values for realistic detector efficiencies. The line at 20% represents Indium Gallium Arsenide (InGaAs) single photon detectors [21] and the line at 85% represents superconducting nanowire single-photon detectors (SNSPDs) [22].…”

Section: Correction With Imperfect Detectorsmentioning

confidence: 99%

Compensation of polarization-dependent loss using noiseless amplification and attenuation

et al. 2019

Self Cite

View full text Add to dashboard Cite

Polarization dependent loss (PDL) is a serious problem that hinders the transfer of polarization qubits through quantum networks. Recently it has been shown that the detrimental effects of PDL on qubit fidelity can be compensated for with the introduction of an additional passive PDL element that rebalances the polarization modes of the transmitted qubit. This procedure works extremely well when the output of the system is postselected on photon detection. However, in cases where the qubit might be needed for further analysis this procedure introduces unwanted vacuum terms into the state. Here we present procedures for the compensation of the effects of PDL using noiseless amplification and attenuation. Each of these techniques introduces a heralding signal into the correction procedure that significantly reduces the vacuum terms in the final state. When detector inefficiency and dark counts are included in the analysis noiseless amplification remains superior, in terms of the fidelity of the final state, to both noiseless attenuation and passive PDL compensation for detector efficiencies greater than 40%.

show abstract

Joint Characterization of Two Single Photon Detectors with a Fiber-based Source of Entangled Photon Pairs

Cited by 4 publications

References 5 publications

Tuning quantum channels to maximize polarization entanglement for telecom photon pairs

Tuning quantum channels to maximize polarization entanglement for telecom photon pairs

Effect of Polarization Dependent Loss on the Quality of Transmitted Polarization Entanglement

Compensation of polarization-dependent loss using noiseless amplification and attenuation

Contact Info

Product

Resources

About