Quantum information transfer using photons

Northup, Tracy E.; Blatt, R.

doi:10.1038/nphoton.2014.53

Cited by 411 publications

(378 citation statements)

References 112 publications

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“…[1][2][3][4] Integrating these components onto a single chip would realize quantum photonic devices that enable quantum communication networks, 1,2 photonic quantum computers, 5,6 and photonic quantum simulators. [7][8][9] Many of these applications rely on optical qubits that exhibit two-photon quantum interference on a beamsplitter, the primary mechanism for achieving effective photon-photon interactions.…”

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confidence: 99%

Two-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters

et al. 2016

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ABSTRACT. Interactions between solid-state quantum emitters and cavities are important for a broad range of applications in quantum communication, linear optical quantum computing, nonlinear photonics, and photonic quantum simulation. These applications often require combining many devices on a single chip with identical emission wavelengths in order to generate two-photon interference, the primary mechanism for achieving effective photon-photon interactions. Such integration remains extremely challenging due to inhomogeneous broadening and fabrication errors that randomize the resonant frequencies of both the emitters and cavities. In this letter we demonstrate two-photon interference from independent cavity-coupled emitters on the same chip, providing a potential solution to this long-standing problem. We overcome spectral mismatch between different cavities due to fabrication errors by depositing and locally evaporating a thin layer of condensed nitrogen. We integrate optical heaters to tune individual dots within each cavity to the same resonance with better than 3 µeV of precision. Combining these tuning methods, we demonstrate two-photon interference between two devices spaced by less than 15 µm on the same chip with a post-selected visibility of 33%. These results pave the way to integrate multiple quantum light sources on the same chip to develop quantum photonic devices.

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confidence: 99%

Two-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters

et al. 2016

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“…This has spurred great activity in exploring hybrid quantum systems with the objective to devise scalable quantum architectures [31]. In particular, generating nonclassical states in atom-photon-coupled hybrid quantum systems has received significant theoretical and experimental interest [32][33][34][35][36][37][38]. Continuing this quest, we envision two spatially-separated BECs confined inside an optical resonator and explore whether macroscopic entanglement between the two atomic BECs can be generated via the coupling to a common photon mode.…”

Section: Model Systemmentioning

confidence: 99%

Cavity-Assisted Generation of Sustainable Macroscopic Entanglement of Ultracold Gases

Joshi

Larson

2015

Atoms

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Prospects for reaching persistent entanglement between two spatially-separated atomic Bose-Einstein condensates are outlined.The system setup comprises two condensates loaded in an optical lattice, which, in return, is confined within a high-Q optical resonator. The system is driven by an external laser that illuminates the atoms, such that photons can scatter into the cavity. In the superradiant phase, a cavity field is established, and we show that the emerging cavity-mediated interactions between the two condensates is capable of entangling them despite photon losses. This macroscopic atomic entanglement is sustained throughout the time-evolution apart from occasions of sudden deaths/births. Using an auxiliary photon mode and coupling it to a collective quadrature of the two condensates, we demonstrate that the auxiliary mode's squeezing is proportional to the atomic entanglement, and as such, it can serve as a probe field of the macroscopic entanglement.

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“…Numerous advances have been achieved in this system, including realization of faithful quantum gates [1][2][3][4][5][6][7], preparation of many-body quantum states [8][9][10][11][12][13][14][15], and quantum teleportation [16,17]. There are also developments to scale up this system, based on either ion shuttling [18][19][20] or quantum networks [21][22][23][24][25][26]). …”

Section: Introductionmentioning

confidence: 99%

Sympathetic cooling in a large ion crystal

Lin

Duan

2015

Quantum Inf Process

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We analyze the dynamics and steady state of a linear ion array when some of the ions are continuously laser cooled. We calculate the ions' local temperature measured by its position fluctuation under various trapping and cooling configurations, taking into account background heating due to the noisy environment. For a large system, we demonstrate that by arranging the cooling ions evenly in the array, one can suppress the overall heating considerably. We also investigate the effect of different cooling rates and find that the optimal cooling efficiency is achieved by an intermediate cooling rate. We discuss the relaxation time for the ions to approach the steady state, and show that with periodic arrangement of the cooling ions, the cooling efficiency does not scale down with the system size.

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Quantum information transfer using photons

Cited by 411 publications

References 112 publications

Two-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters

Two-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters

Cavity-Assisted Generation of Sustainable Macroscopic Entanglement of Ultracold Gases

Sympathetic cooling in a large ion crystal

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