Efficient Bell state analyzer for time-bin qubits with fast-recovery WSi superconducting single photon detectors

Valivarthi, Raju; Lucio-Martinez, I.; Rubenok, Allison; Chan, P.C.H.; Marsili, Francesco; Verma, Varun B.; Shaw, Matthew D.; Stern, Jeffrey A.; Slater, Joshua A.; Oblak, Daniel; Nam, Sae Woo; Tittel, Wolfgang

doi:10.1364/oe.22.024497

Cited by 26 publications

(17 citation statements)

References 25 publications

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“…Note that we only monitor projections onto |ψ − AB for the results discussed here, which reduces the maximum efficiency (assuming lossless detection) to 25%. However, BSM projections onto both |ψ − AB and |ψ + AB have been demonstrated [52]. The performance of the BSM unit, and in turn an MDI-QKD system, is determined by several detector properties, including the detection efficiency η det , noise, gate rate, recovery time, and detector type.…”

Section: Bsm Unitmentioning

confidence: 99%

Measurement-device-independent quantum key distribution: from idea towards application

Valivarthi

Lucio-Martinez

Chan

et al. 2015

Journal of Modern Optics

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We assess the overall performance of our quantum key distribution (QKD) system implementing the measurement-device-independent (MDI) protocol using components with varying capabilities such as different single-photon detectors and qubit preparation hardware. We experimentally show that superconducting nanowire single-photon detectors allow QKD over a channel featuring 60 dB loss, and QKD with more than 600 bits of secret key per second (not considering finite key effects) over a 16 dB loss channel. This corresponds to 300 and 80 km of standard telecommunication fiber, respectively. We also demonstrate that the integration of our QKD system into FPGAbased hardware (instead of state-of-the-art arbitrary waveform generators) does not impact on its performance. Our investigation allows us to acquire an improved understanding of the trade-offs between complexity, cost and system performance, which is required for future customization of MDI-QKD. Given that our system can be operated outside the laboratory over deployed fiber, we conclude that MDI-QKD is a promising approach to information-theoretic secure key distribution.

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Section: Bsm Unitmentioning

confidence: 99%

Measurement-device-independent quantum key distribution: from idea towards application

Valivarthi

Lucio-Martinez

Chan

et al. 2015

Journal of Modern Optics

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“…Furthermore, InGaAs has a nearly inexistent lattice mismatch with the InP substrate, which results in its very good performance. To date, high responsivities of > 1 A/W [34], large bandwidths up to 100 GHz [48,59], high quantum efficiencies of > 90% [34,47], high speeds of~50 Gb/s [60,61], and low dark currents of < 10 pA [34,59] have been demonstrated based on the InGaAs system. There is no other material currently better than InGaAs in terms of the photodetection performance.…”

Section: Discussionmentioning

confidence: 99%

“…Using narrow InGaAs multiplication layer widths, a very low dark current of 10 -300 nA with a 3 dBbandwidth of 80 GHz was achieved [59]. Recent efforts focused on extending the capability of InGaAs APDs for error-free, high-speed modern communication (~50 Gb/s) as well as single photon detection systems [60,61].…”

Section: In X Ga 1−x As Pdsmentioning

confidence: 99%

State-of-the-art photodetectors for optoelectronic integration at telecommunication wavelength

2015

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Photodetectors hold a critical position in optoelectronic integrated circuits, and they convert light into electricity. Over the past decades, high-performance photodetectors (PDs) have been aggressively pursued to enable high-speed, large-bandwidth, and low-noise communication applications. Various material systems have been explored and different structures designed to improve photodetection capability as well as compatibility with CMOS circuits. In this paper, we review state-of-theart photodetection technologies in the telecommunications spectrum based on different material systems, including traditional semiconductors such as InGaAs, Si, Ge and HgCdTe, as well as recently developed systems such as low-dimensional materials (e.g. graphene, carbon nanotube, etc.) and noble metal plasmons. The corresponding material properties, fundamental mechanisms, fabrication, theoretical modelling and performance of the typical PDs are presented, including the emerging directions and perspectives of the PDs for optoelectronic integration applications are discussed.

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“…We note that, in principle, it is also possible to make projection measurements onto the |Ψ + Bell state, thereby increasing the measurement's efficiency from maximally 25% to 50% [26]. To detect the 1533 nm photons, we use free-running, tungsten silicide (WSi)-based superconducting nanowire single-photon detectors (SNSPD) cooled to around 0.9 Kelvin [27].…”

Section: Methodsmentioning

confidence: 99%

Entanglement swapping with quantum-memory-compatible photons

et al. 2015

Self Cite

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We report entanglement swapping with time-bin entangled photon pairs, each constituted of a 795 nm photon and a 1533 nm photon, that are created via spontaneous parametric down conversion in a non-linear crystal. After projecting the two 1533 nm photons onto a Bell state, entanglement between the two 795 nm photons is verified by means of quantum state tomography. As an important feature, the wavelength and bandwidth of the 795 nm photons is compatible with Tm:LiNbO3-based quantum memories, making our experiment an important step towards the realization of a quantum repeater.

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Efficient Bell state analyzer for time-bin qubits with fast-recovery WSi superconducting single photon detectors

Cited by 26 publications

References 25 publications

Measurement-device-independent quantum key distribution: from idea towards application

Measurement-device-independent quantum key distribution: from idea towards application

State-of-the-art photodetectors for optoelectronic integration at telecommunication wavelength

Entanglement swapping with quantum-memory-compatible photons

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