Noiseless attenuation using an optical parametric amplifier

Brewster, R. A.; Nodurft, I. C.; Pittman, T. B.; Franson, J. D.

doi:10.1103/physreva.96.042307

Cited by 23 publications

(29 citation statements)

References 32 publications

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“…In summary, we have shown that increased attenuation of a coherent state by an atomic medium can occur in the absence of any actual absorption. This counterintuitive result is somewhat similar to our earlier work on noiseless attenuation using an OPA [12]. Optical amplification instead of attenuation can also occur for certain values of the coupling parameter r. These results are of fundamental interest and they represent a potentially useful method for optical amplification.…”

Section: Discussion and Summarysupporting

confidence: 84%

“…Post-selection and heralding are used in quantum optics for a wide range of applications, such as linear optics quantum logic gates [1][2][3][4][5], noiseless amplification [6][7][8][9] and attenuation [10][11][12], and the quantum engineering of nonclassical states [13][14][15]. Here we consider the effects of post-selection when a coherent state of light (laser beam) propagates through an atomic medium where all of the atoms are initially in their ground state.…”

Section: Introductionmentioning

confidence: 99%

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Optical Attenuation without Absorption

Nodurft

Brewster

Pittman

et al. 2019

Frontiers in Optics + Laser Science APS/DLS

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We consider a coherent state of light propagating through an ensemble of two-level atoms where all the atoms are initially in their ground state. In ordinary absorption, the transition of atoms to their excited state along with the absorption of a photon will remove energy from the beam and attenuate the signal. Here we show that post-selecting on those cases in which none of the atoms made a transition to the excited state can give even more attenuation than would normally occur due to absorption. The same process can also produce amplification when there is a sufficiently strong interaction between the photons and the atoms.

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Section: Discussion and Summarysupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Optical Attenuation without Absorption

Nodurft

Brewster

Pittman

et al. 2019

Frontiers in Optics + Laser Science APS/DLS

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“…Although the violation of Bell's inequality is sensitive to photon loss, Micuda et al [16] have shown that an arbitrary quantum state can be transmitted through a lossy channel with negligible decoherence due to photon loss if the signal is noiselessly attenuated [16,28] before transmission, followed by noiseless amplification [29] after transmission. Roughly speaking, the noiseless attenuation can be used to reduce the intensity of the field to the point that the mean number of photons lost is much less than 1 and no significant whichpath information is left in the environment.…”

Section: Violations Of Bell's Inequalitymentioning

confidence: 99%

Generating entangled Schrödinger cat states using a number state and a beam splitter

Shringarpure

Franson

2020

Phys. Rev. A

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Passing a photon number state through a balanced beam splitter will produce an entangled state in which the phases of the two output beams are highly correlated. This entangled state can be viewed as a generalized form of a Schrödinger cat state where there is an equal probability amplitude for all possible phases. We show that Bell's inequality can be violated using this entangled state and two distant measuring devices that consist of a single-photon interferometer with a Kerr medium in one path, a set of single-photon detectors, and postselection based on a homodyne measurement. These entangled states are sensitive to photon loss and a violation of Bell's inequality requires either that the losses are inherently small or that their effects have been minimized using linear optics techniques [Micuda et al., Phys. Rev. Lett. 109, 180503 (2012)]. Somewhat surprisingly, the use of the fair sampling assumption is not required for a violation of Bell's inequality despite the use of postselection if the measurements are made in the correct order.

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“…This equivalence allows an optical parametric amplifier to be used with conditional measurements in a way that is somewhat analogous to the use of a beam splitter. This has been applied, for example, to the noiseless attenuation of coherent states [22] and the preparation of various non-classical states [23][24][25], and it provides part of the motivation for the work reported here. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Generating photon-added states without adding a photon

Shringarpure

Franson

2019

Phys. Rev. A

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We show that a continuous range of nonclassical states of light can be generated using conditional measurements on the idler mode of an optical parametric amplifier. The output state is prepared by introducing a coherent state in the signal mode of the amplifier with a single photon in the idler mode, followed by a conditional measurement of a single photon in the output idler mode. By varying the gain of the amplifier, this approach can produce a coherent state, a photon-added state, a displaced number state, or a continuous range of other nonclassical states with intermediate properties. We note that this approach can generate a photon-added state even though the postselected amplifier does not add any photons to the signal or idler modes. The ability to generate a continuous range of nonclassical states may have practical applications in quantum information processing.

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Noiseless attenuation using an optical parametric amplifier

Cited by 23 publications

References 32 publications

Optical Attenuation without Absorption

Optical Attenuation without Absorption

Generating entangled Schrödinger cat states using a number state and a beam splitter

Generating photon-added states without adding a photon

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