Demonstration of Channel Multiplexing Quantum Communication Exploiting Entangled Sideband Modes

Shi, Shengli; Liang, Tian; Wang, Yajun; Zheng, Yaohui; Xie, Changde; Peng, Kunchi

doi:10.1103/physrevlett.125.070502

Cited by 57 publications

(22 citation statements)

References 52 publications

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“…13.8 dB squeezed vacuum states with 20.2 dB anti‐squeezing are produced by OPOs, [ 39 ] where the semi‐monolithic single‐resonant standing wave cavity is formed by a piezo‐actuated concave mirror and the back surface of a periodically poled KTiOPO

_{4}

(PPKTP) crystal with a dimension of 1 mm

\times

2 mm

\times

10 mm. [ 40 ] In addition, to verify the universality of the squeezing gate reported here, one has to create the input states located at arbitrary location of the phase space, and this is realized by modulating the fundamental beam at 3 MHz sideband frequency using electro‐optical phase and amplitude modulators. Notice that all the relative phases, including those in the beam interference and homodyne detection, are actively stabilized during the measurement cycle in order to suppress the noise coupling of anti‐squeezing as much as possible.…”

Section: Quantum Protocolmentioning

confidence: 99%

Deterministic and Universal Quantum Squeezing Gate with a Teleportation‐Like Protocol

Sun

Wang

Tian

et al. 2021

Laser & Photonics Reviews

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Squeezing transformation as an essential component of quantum information processing, gives rise to the possibility to perform various tasks such as distributed quantum computation and the quantum‐logic gate. However, the reported squeezing gate with best performance so far is realized with low success probability, while the performance of the deterministic ones is currently circumscribed by the limited squeezing degree of the nonclassical ancilla. To address this issue, a new scheme of deterministic and universal quantum squeezing gate with the property of nonlocal operation owing to the teleportation‐like protocol is developed and demonstrated. A high‐fidelity squeezing operation, even when the level of target squeezing being up to 10 dB, is demonstrated where a squeezed state with nonclassical noise reduction of 6.5 dB is directly observed. Moreover, a high‐fidelity complex operation including a Fourier transformation and a phase squeezing gate are performed, exploring the potential of implementing the complex task of quantum information processing with the presented functional unit. The method can be applied to distributed quantum processor, the creation of exotic nonclassical states, and quantum error correction.

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_{4}

(PPKTP) crystal with a dimension of 1 mm

\times

2 mm

\times

Section: Quantum Protocolmentioning

confidence: 99%

Deterministic and Universal Quantum Squeezing Gate with a Teleportation‐Like Protocol

Sun

Wang

Tian

et al. 2021

Laser & Photonics Reviews

Self Cite

View full text Add to dashboard Cite

show abstract

“…If, on the other hand, we chose 𝑡 𝑟 = 𝑇 2 𝑡 𝑐 𝑇 2 𝑡 𝑐 +𝑇 1 𝑟 𝑐 , the cross talk will be eliminated from the second mode, but not from the first one. It is easy to see, that if 𝑇 1 = 𝑇 2 ≡ 𝑇, (22) and ( 23)…”

Section: Cross Talk Compensation By Optical Interferencementioning

confidence: 99%

“…Advantageously, CV entanglement can be deterministically generated reaching two-mode squeezing bellow −10𝑑𝐵 (corresponds to logarithmic negativity up to 𝐿𝑁 = 4.3) [18]. In CV quantum communication, one of the possible ways to simultaneously transfer many entangled states during the same period of time is to use frequency or spatial multiplexing of quantum states residing in different modes [19][20][21][22]. Such an approach was in particular used to improve quantum communication with multiplexed QKD [23] or with multiplexed quantum teleportation using frequency pulse modes [24].…”

Section: Introductionmentioning

confidence: 99%

Cross talk compensation in multimode continuous-variable entanglement distribution

Kovalenko,

Usenko,

Filip

2021

Preprint

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Two-mode squeezed states are scalable and robust entanglement resources for continuous-variable and hybrid quantum information protocols at a distance. We consider the effect of a linear cross talk in the multimode distribution of two-mode squeezed states propagating through parallel similar channels. First, to reduce degradation of the distributed Gaussian entanglement, we show that the initial two-mode squeezing entering the channel should be optimized already in the presence of a small cross talk. Second, we suggest simultaneous optimization of relative phase between the modes and their linear coupling on a receiver side prior to the use of entanglement, which can fully compensate the cross talk once the channel transmittance is the same for all the modes. For the realistic channels with similar transmittance values for either of the modes, the cross talk can be still largely compensated. This method relying on the mode interference overcomes an alternative method of entanglement localization in one pair of modes using measurement on another pair and feed-forward control. Our theoretical results pave the way to more efficient use of multimode continuous-variable photonic entanglement in scalable quantum networks with cross talk.

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“…In addition to the improvements of utilizing high-efficiency quantum interface and suitable bandwidth in communication channels, a multiplexing scheme of quantum memories in space [19,20], time [21] or frequencies [22][23][24][25][26][27][28][29] can further allow a higher communication capacity of entanglement in respective continuous spaces, leading to a multimode quantum information processing [30][31][32]. This is in contrast to the system using finite and discrete degrees of freedom, where paths, polarization, or orbital angular momenta can be employed for entanglement generation [33,34].…”

Section: Introductionmentioning

confidence: 99%

Almost indistinguishable single photons via multiplexing cascaded biphotons with cavity modulation and phase compensation

Wong,

Chang,

Jen

2022

Preprint

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The cascade-emitted biphotons generated from the alkali metal atomic ensembles are an excellent entanglement resource which enables long-distance quantum communication. The communication of quantum information between distant locations can be realized by utilizing the low-loss telecom bandwidth in the upper transition of the cascaded photons in a fiber-based quantum network. Meanwhile, the infrared photon from the lower transition of this highly directional and frequency-correlated biphoton can be created under the fourwave mixing process and can be stored locally as a collective spin wave. Here we theoretically investigate the frequency entanglement of this biphoton and propose two approaches to remove their mutual correlations in frequency spaces. The first approach applies an optical cavity which modulates the biphoton spectrum into a more symmetric and narrow spectral function by multiplexing multiple atomic ensembles with phase compensation. The purity of single photon reaches up to 0.999 and the entanglement entropy S of the biphoton reduces to 0.006, which is 200 times smaller than the one without multiplexing. The other approach employs a symmetric pumping of the laser fields in two atomic ensembles, which leads to a moderate reduction of S ∼ 0.3 when non-discrimination detection devices are used for both photons. An extremely low frequency entanglement implies an almost indistinguishable single photon source, which offers a potential resource for photonic quantum simulation and computation.

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Demonstration of Channel Multiplexing Quantum Communication Exploiting Entangled Sideband Modes

Cited by 57 publications

References 52 publications

Deterministic and Universal Quantum Squeezing Gate with a Teleportation‐Like Protocol

Deterministic and Universal Quantum Squeezing Gate with a Teleportation‐Like Protocol

Cross talk compensation in multimode continuous-variable entanglement distribution

Almost indistinguishable single photons via multiplexing cascaded biphotons with cavity modulation and phase compensation

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