Setting a disordered password on a photonic memory

Su, Shih Wei; Gou, Shih-Chuan; Chew, Lock Yue; Chang, Yu-Yen; Yu, Ite A.; Калачев, А. А.; Liao, Wen-Te

doi:10.1103/physreva.95.061805

Cited by 10 publications

(3 citation statements)

References 43 publications

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“…In particular, the ac-Stark shift caused by an additional light field has been proposed as a versatile way to realize the GEM scheme [24]. Recent theoretical proposals went beyond the simple gradient shape and suggested to engineer the stored spin-wave shape to realize Kapitsa-Dirac diffraction [25] or a quantum memory protected with a disordered password [26]. Finally, a recent experiment used the ac-Stark shift to realize a spin-wave beamsplitter at the single-excitation level demonstrating Hong-Ou-Mandel interference for stored light [27].…”

Section: Introductionmentioning

confidence: 99%

Coherent spin-wave processor of stored optical pulses

et al. 2019

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A device being a pinnacle of development of an optical quantum memory should combine the capabilities of storage, inter-communication and processing of stored information. In particular, the ability to capture a train of optical pulses, interfere them in an arbitrary way and finally perform on-demand release would in a loose sense realize an optical analogue of a Turing Machine. Here we demonstrate the operation of an optical quantum memory being able to store optical pulses in the form of collective spin-wave excitations in a multi-dimensional wavevector space. During storage, we perform complex beamsplitter operations and demonstrate a variety of protocol implemented as the processing stage, including interfering a pair of spin-wave modes with 95% visibility. By engineering the phase-matching at the readout stage we realize the on-demand retrieval. The highly multimode structure of the presented quantum memory lends itself both to enhancing classical optical telecommunication as well as parallel processing of optical qubits at the single-photon level. arXiv:1808.00927v1 [quant-ph]

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Section: Introductionmentioning

confidence: 99%

Coherent spin-wave processor of stored optical pulses

et al. 2019

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“…Besides, recent works have led to the realization of robust authentication protocols based on quantum passwords [32,33]. Recently, encrypted data storage by the application of a disordered field on photonic quantum memories has been accomplished [34].…”

Section: Introductionmentioning

confidence: 99%

Quantum Locker Using a Novel Verification Algorithm and Its Experimental Realization in IBM Quantum Computer

Dash,

Rout,

Behera

et al. 2017

Preprint

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It is well known that Grover's algorithm asymptotically transforms an equal superposition state into an eigenstate (of a given basis). Here, we demonstrate a verification algorithm based on weak measurement which can achieve the same purpose even if the qubit is not in an equal superposition state. The proposed algorithm highlights the distinguishability between any arbitrary single qubit superposition state and an eigenstate. We apply this algorithm to propose the scheme of a Quantum Locker, a protocol in which any legitimate party can verify his/her authenticity by using a newly developed quantum One-Time Password (OTP) and retrieve the necessary message from the locker. We formally explicate the working of quantum locker in association with the quantum OTP, which theoretically offers a much higher security against any adversary, as compared to any classical security device.

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“…The former is used to optimize the echo efficiency, and the latter is intended for beating the theoretically maximum echo efficiency of 54% [27,30]. In view of the success of the optical echo memory [30][31][32][33][34][35][36] based on atomic frequency comb (AFC) [37,38], our scheme gives an importnat step for the development of future γ-ray echo memory [27]. Moreover, the present results suggest applications such as a γ-ray coherent delay line providing an input γ-ray pulse with a tunable time delay, and the generation of time-bin qubit for single γ quanta.…”

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confidence: 99%

Spectral control over $γ$-ray echo using a nuclear frequency comb system

Yeh,

Lin,

Zhang

et al. 2019

Preprint

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Two kinds of spectral control over γ-ray echo using a nuclear frequency comb system are theoretically investigated. A nuclear frequency comb system is composed of multiple nuclear targets under magnetization (hyperfine splitting), mechanical motion (Doppler shift) or both, namely, moving and magnetized targets. In frequency domain the unperturbed single absorption line of γ-ray therefore splits into multiple lines with equal spacing and becomes a nuclear frequency comb structure. We introduce spectral shaping and dynamical splitting to the frequency comb structure respectively to optimize the use of a medium and to break the theoretical maximum of echo efficiency, i.e., 54%. Spectral shaping scheme leads to the reduction of required sample resonant thickness for achieving high echo efficiency of especially a broadband input. Dynamical splitting method significantly advances the echo efficiency up to 67% revealed by two equivalent nuclear frequency comb systems. We also show that using only few targets is enough to obtain good echo performance, which significantly eases the complexity of implementation. Our results extend quantum optics to 10keV regime and lay the foundation of the development of γ-ray memory.

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Setting a disordered password on a photonic memory

Cited by 10 publications

References 43 publications

Coherent spin-wave processor of stored optical pulses

Coherent spin-wave processor of stored optical pulses

Quantum Locker Using a Novel Verification Algorithm and Its Experimental Realization in IBM Quantum Computer

Spectral control over $γ$-ray echo using a nuclear frequency comb system

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