Sub-picosecond active timing control over fiber optic cable

Celano, Tom; Stein, S.; Gifford, G.A.; Mesander, B.A.; Ramsey, B.J.

doi:10.1109/freq.2002.1075937

Cited by 13 publications

(9 citation statements)

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“…an atomic clock. These reference oscillators can be synchronized remotely to subpicosecond accuracy [44,45,46], which would be sufficient for our purposes. Recent results [47] show that even better remote timing stability is achievable with state-ofthe-art technology.…”

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High-fidelity entanglement swapping with fully independent sources

et al. 2009

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Entanglement swapping allows to establish entanglement between independent particles that never interacted nor share any common past. This feature makes it an integral constituent of quantum repeaters. Here, we demonstrate entanglement swapping with time-synchronized independent sources with a fidelity high enough to violate a Clauser-Horne-Shimony-Holt inequality by more than four standard deviations. The fact that both entangled pairs are created by fully independent, only electronically connected sources ensures that this technique is suitable for future long-distance quantum communication experiments as well as for novel tests on the foundations of quantum physics.To take full advantage of the powerful features of quantum information processing schemes [1], large scale quantum networks will have to be realized. These will inevitably involve the reliable distribution of entanglement [2] between distant, independent nodes. Photons are well suited to cover these distances as they do not tend to interact with the environment and can easily be transmitted via fibers or optical free-space links. Today, these methods are limited to distances on the order of a hundred kilometers [4, 5? ] due to photon loss and detector noise [6]. Quantum repeaters [7,8,9,10], which repeatedly swap and distill entanglement along a chain of distant sources, are expected to overcome this limitation.The three principal ingredients of quantum repeaters are quantum memories [9,10], entanglement distillation [11,12], and entanglement swapping [13]. While a real-world implementation of a quantum repeater is still far down the road, gradual progress has been achieved in realizing its constituents [14, 16, 17, 18, 19, 20, 21, 22? ]. In particular any future realization of a quantum repeater will involve entanglement swapping with pairs emitted from distant, independent sources.Recently, the independence of the sources used for entanglement swapping was shown to be not only of practical interest. In [23] it is argued that independence in such an experiment allows to place even tighter restrictions on local hidden variable theories [24] than in experiments on pairs emitted directly by one source. This allows to circumvent the loophole of inefficient detectors. Therefore, the use of independent sources for entanglement swapping could help to close all loop holes, which up to now had to be closed in separate experiments [22,25,26,27] [22]. In all of these experiments a crucial requirement for use in quantum repeaters remains unfulfilled: the sources must be separable by large distances. In [14, 18, 20, 22? ] the entangled pairs were created by interaction of one optical pump with one or two nonlinear media, while in [28] the two laser beams pumping two separate nonlinear media were not optically independent. To separate the sources in any of these implementations would require to distribute intense pump beams over large distances. That goal is practically unfeasible given dispersion, high loss at the pump wavelengths and path length fluctuation...

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confidence: 99%

High-fidelity entanglement swapping with fully independent sources

et al. 2009

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“…Equations (4,5,6) have shown the range of the temporal drift excited by the polarization change. Among them the most important case is the system with a relatively small SOPD, since the SOPD will be limited by the requirement of maintaining the efficiency of the RF power generation anyway.…”

Section: A Magnitude Of the Temporal Driftmentioning

confidence: 99%

“…A polarimeter is used to measure output polarization while the fiber stretcher is being stretched. The SOPC can be then calculated by using (4).…”

Section: Sopc Of the Fiber Stretchermentioning

confidence: 99%

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The Temporal Drift Due to Polarization Noise in a Photonic Phase Reference Distribution System

Shen

Gomes

Shillue

et al. 2008

J. Lightwave Technol.

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 Abstract-The temporal drift due to the polarization noise in an ultra-low temporal drift photonic phase reference distribution system is analyzed. The temporal drift is shown to be associated with the polarization changes, the differential group delay of the subsequent parts, and, the state of polarization dispersion of the photonic local oscillator signal. Such temporal drift cannot be corrected by Line Length Correction schemes. As an example, polarization changes from a fiber stretcher are presented, discussed, and identified as one of the major contributors to the system temporal drift. A numerical model is developed. The magnitude and statistical distribution (based on random coupling) of the temporal drift excited by the polarization change of the fiber stretcher are investigated. Experimental work demonstrates that reduction in the polarization change successfully reduces the temporal drift, as predicted by the theory and simulation.

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“…When environmentally isolated, the stability of fiber cable is considerably greater than open-air paths. Hence, fiber networks can be widely used in transmitting frequency standards and timing signals [1][2][3]. In many applications, a high quality analogue continuous wave (CW) signal must be generated at a central site and then delivered to different remote sites through the optical fiber distribution network.…”

Section: Introductionmentioning

confidence: 99%

Polarization Mode Noise in Ultra-low Drift Phase Reference Distribution System over a Fiber Network

Shen

Gomes²,

Davies³

et al. 2005

2005 International Topical Meeting on Microwave Photonics

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-The impact of polarization mode noise on the temporal drift of a delivered analogue phase reference signal through an optical fiber network is studied. The relationship between the dispersion of the state of polarization, change of the state of polarization and the maximum temporal drift of the LO signal is established. The resulting temporal drift can be larger than the PMD value of the receiver under certain conditions. It is a significant contributor to the temporal drift in the ultra-low drift phase reference distribution system, especially when motion of the fiber has to be present in the system. Index Terms -Optical fiber, phase reference, phase drift, polarization mode dispersion, analogue signal, state of polarization dispersion, state of polarization change

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Sub-picosecond active timing control over fiber optic cable

Cited by 13 publications

References 0 publications

High-fidelity entanglement swapping with fully independent sources

High-fidelity entanglement swapping with fully independent sources

The Temporal Drift Due to Polarization Noise in a Photonic Phase Reference Distribution System

Polarization Mode Noise in Ultra-low Drift Phase Reference Distribution System over a Fiber Network

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