High-dimensional quantum key distribution using dispersive optics

Mower, Jacob; Zhang, Zheshen; Desjardins, Pierre; Lee, Catherine; Shapiro, Jeffrey H.; Englund, Dirk

doi:10.1103/physreva.87.062322

Cited by 168 publications

(203 citation statements)

References 33 publications

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“…random phase shifts are applied. Alternatively, one can employ random unitaries from a set of dispersive transformations [31]. To decode the message, the legitimate receiver can first apply the inverse transformation of the encoding one (both are linear passive transformations), then measure by photodetection [9].…”

Section: Discussionmentioning

confidence: 99%

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Robust quantum data locking from phase modulation

2014

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Quantum data locking is a uniquely quantum phenomenon that allows a relatively short key of constant size to (un)lock an arbitrarily long message encoded in a quantum state, in such a way that an eavesdropper who measures the state but does not know the key has essentially no information about the message. The application of quantum data locking in cryptography would allow one to overcome the limitations of the one-time pad encryption, which requires the key to have the same length as the message. However, it is known that the strength of quantum data locking is also its Achilles heel, as the leakage of a few bits of the key or the message may in principle allow the eavesdropper to unlock a disproportionate amount of information. In this paper we show that there exist quantum data locking schemes that can be made robust against information leakage by increasing the length of the key by a proportionate amount. This implies that a constant size key can still lock an arbitrarily long message as long as a fraction of it remains secret to the eavesdropper. Moreover, we greatly simplify the structure of the protocol by proving that phase modulation suffices to generate strong locking schemes, paving the way to optical experimental realizations. Also, we show that successful data locking protocols can be constructed using random code words, which very well could be helpful in discovering random codes for data locking over noisy quantum channels.

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Section: Discussionmentioning

confidence: 99%

“…), then by applying independent random phase shifts to each mode. If information is encoded in the arrival time, the codewords can be prepared by first applying a linear dispersion transformation (see, e.g., [31]) and then random phase shifts at different times.…”

Section: Applicationsmentioning

confidence: 99%

Robust quantum data locking from phase modulation

2014

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“…This nonlocal dispersion cancellation effect can enhance security in QKD by serving as a non-orthogonal basis to direct time-correlation measurements [19,20]. First, we use four sideband pairs (S 2−5 I 2−5 ) and measure the correlation function in the absence of dispersion (Fig.…”

Section: Compiled June 13 2017mentioning

confidence: 99%

Persistent energy–time entanglement covering multiple resonances of an on-chip biphoton frequency comb

Jaramillo-Villegas

Imany

Odele

et al. 2017

Optica

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We investigate the time-frequency signatures of an on-chip biphoton frequency comb (BFC) generated from a silicon nitride microring resonator. Using a Franson interferometer, we examine, for the first time, the multifrequency nature of the photon pair source in a time entanglement measurement scheme; having multiple frequency modes from the BFC results in a modulation of the interference pattern. This measurement together with a Schmidt mode decomposition shows that the generated continuous variable energy-time entangled state spans multiple pair-wise modes. Additionally, we demonstrate nonlocal dispersion cancellation, a foundational concept in time-energy entanglement, suggesting the potential of the chip-scale BFC for large-alphabet quantum key distribution. © 2017 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. Quantum information processing (QIP) promises to improve the security of our communications as well as to solve some algorithms with exponential complexity in polynomial time [1]. The fundamental unit of quantum information is based on a superposition of two states, the so-called qubit. It has been proposed to extend this concept to a superposition of many states (known as a high-dimensional state) for higher density information encodings, fault-tolerant quantum computing, and even for secure protocols in dense quantum key distribution.Entangled photon pairs have been demonstrated as one of the most promising platforms for implementing QIP systems. In recent years, generation of entangled photons on chip has gained attention because of its reduced cost and compatibility with semiconductor foundries [2][3][4][5]. Despite Biphoton Frequency Combs (BFC) have been generated using cavity-filtered broadband biphotons [6] and cavity-enhanced spontaneous parametric down conversion [7], it was only recently that on-chip microresonators have been used to generate entangled photons in the form of a BFC [8][9][10]. These demonstrations suggest the use of chip-scale sources for high-dimensional quantum processing [11][12][13]. However, studies such as [4, 9, 10] only focused on single sideband pairs-the multifrequency nature of their sources (important for high-dimensional quantum processing) was not explored. In this Letter, we present the first examination of the time-frequency signatures of an on-chip BFC generated from a silicon nitride microring resonator. Through Franson interferometry and a demonstration of nonlocal dispersion compensation, we are able to examine the multifrequency nature of our photon-pair source. Figure 1 is a depiction of our experimental setup. To generate our BFC, we use a tunable continuous-wave (CW) laser to pump a microring at the resonance located at the frequency ω p (λ p ∼ 1550.9 nm). Through spontaneous four-wave mixing process, two pump photons decay int...

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“…Recently, based on time-energy entanglement and dispersive optics, a so-called dispersive optic HD-QKD [21] was proposed. It has been proven that the protocol is secure against Gaussian collective attacks [22].…”

Section: Introductionmentioning

confidence: 99%

Detector-decoy high-dimensional quantum key distribution

Bao

Wang

et al. 2016

Opt. Express

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Abstract. The decoy-state high-dimensional quantum key distribution provides a practical secure way to share more private information with high photon-information efficiency. In this paper, based on detector-decoy method, we propose a detector-decoy high-dimensional quantum key distribution protocol. Employing threshold detectors and a variable attenuator, we can estimate single-photon fraction of postselected events and Eves Holevo information under the Gaussian collective attack with much simpler operations in practical implementation. By numerical evaluation, we show that without varying source intensity and optimizing decoy-state intensity, our protocol could perform much better than one-decoy-state protocol and as well as the two-decoystate protocol. Specially, when the detector efficiency is lower, the advantage of the detector-decoy method becomes more prominent.

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High-dimensional quantum key distribution using dispersive optics

Cited by 168 publications

References 33 publications

Robust quantum data locking from phase modulation

Robust quantum data locking from phase modulation

Persistent energy–time entanglement covering multiple resonances of an on-chip biphoton frequency comb

Detector-decoy high-dimensional quantum key distribution

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