Generation of heralded optical `Schroedinger cat' states by photon-addition

• URL: http://arxiv.org/abs/2306.13011v1
• Date: Thu, 22 Jun 2023 16:21:42 GMT
• Title: Generation of heralded optical `Schroedinger cat' states by photon-addition
• Authors: Yi-Ru Chen, Hsien-Yi Hsieh, Jingyu Ning, Hsun-Chung Wu, Hua Li Chen, Zi-Hao Shi, Popo Yang, Ole Steuernagel, Chien-Ming Wu, and Ray-Kuang Lee
• Abstract summary: We report the first experimental realization of optical "Schr"odinger cats" by adding a photon to a squeezed vacuum state. We generate "Schr"odinger cats" at rates exceeding $8.5 times 104$ counts per second.
• Score: 3.093409936654924
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Optical "Schr\"odinger cat" states, the non-classical superposition of two quasi-classical coherent states, serve as a basis for gedanken experiments testing quantum physics on mesoscopic scales and are increasingly recognized as a resource for quantum information processing. Here, we report the first experimental realization of optical "Schr\"odinger cats" by adding a photon to a squeezed vacuum state, so far only photon-subtraction protocols have been realized. Photon-addition gives us the advantage of using heralded signal photons as experimental triggers, and we can generate "Schr\"odinger cats" at rates exceeding $8.5 \times 10^4$ counts per second; at least one order of magnitude higher than all previously reported realizations. Wigner distributions with pronounced negative parts are demonstrated at down to -8.89 dB squeezing, even when the initial squeezed vacuum input state has low purity. Benchmarking against such a degraded squeezed input state we report a maximum fidelity of more than 80% with a maximum cat amplitude of $|\alpha| \approx 1.66$. Our experiment uses photon-addition from pairs, one of those photons is used for monitoring, giving us enhanced control; moreover the pair production rates are high and should allow for repeated application of photon-addition via repeat-stages.

Related papers

• Nonlinear optics using intense optical Schr\"odinger "cat" states [0.0]
  We show the generation of a femtosecond duration optical "cat" state in the infrared spectral range. These states exhibit intensities sufficient to induce nonlinear processes in matter. The findings introduce the optical "cat" states into the realm of nonlinear quantum optics, opening up exciting new paths in quantum information science.
  arXiv  Detail & Related papers  (2023-06-26T07:47:30Z)
• Integrated Quantum Optical Phase Sensor [48.7576911714538]
  We present a photonic integrated circuit fabricated in thin-film lithium niobate. We use the second-order nonlinearity to produce a squeezed state at the same frequency as the pump light and realize circuit control and sensing with electro-optics. We anticipate that on-chip photonic systems like this, which operate with low power and integrate all of the needed functionality on a single die, will open new opportunities for quantum optical sensing.
  arXiv  Detail & Related papers  (2022-12-19T18:46:33Z)
• Amplification of cascaded downconversion by reusing photons with a switchable cavity [62.997667081978825]
  We propose a scheme to amplify triplet production rates by using a fast switch and a delay loop. Our proof-of-concept device increases the rate of detected photon triplets as predicted.
  arXiv  Detail & Related papers  (2022-09-23T15:53:44Z)
• Quantum density matrix theory for a laser without adiabatic elimination of the population inversion: transition to lasing in the class-B limit [62.997667081978825]
  No class-B quantum density-matrix model is available to date, capable of accurately describing coherence and photon correlations within a unified theory. Here we carry out a density-matrix theoretical approach for generic class-B lasers, and provide closed equations for the photonic and atomic reduced density matrix in the Fock basis of photons. This model enables the study of few-photon bifurcations and non-classical photon correlations in class-B laser devices, also leveraging quantum descriptions of coherently coupled nanolaser arrays.
  arXiv  Detail & Related papers  (2022-05-26T16:33:51Z)
• Theory of Photon Subtraction for Two-Mode Entangled Light Beams [0.0]
  We introduce a model of entangled light beams leading to the subtraction of photons in one of the modes. We show that photon subtraction does not produce nonclassical fields from classical fields. We also show that injecting optical cats into a beam splitter gives rise to entangled states in the Bell representation.
  arXiv  Detail & Related papers  (2021-08-27T23:21:37Z)
• Entanglement between a telecom photon and an on-demand multimode solid-state quantum memory [52.77024349608834]
  We show the first demonstration of entanglement between a telecom photon and a collective spin excitation in a multimode solid-state quantum memory. We extend the entanglement storage in the quantum memory for up to 47.7$mu$s, which could allow for the distribution of entanglement between quantum nodes separated by distances of up to 10 km.
  arXiv  Detail & Related papers  (2021-06-09T13:59:26Z)
• Generation of optical Schr\"{o}dinger's cat states by generalized photon subtraction [0.0]
  We propose a high-rate generation method of optical Schr"odinger's cat states. Our method relaxes the constraints on experimental parameters, allowing us to optimize them and attain a high generation rate.
  arXiv  Detail & Related papers  (2020-09-18T01:19:57Z)
• Generation of Schr\"odinger cat states through photon-assisted Landau-Zener-St\"uckelberg interferometry [0.0]
  We propose a conceptually new method for creating Schr"odinger cat states, based on photon-assisted Landau-Zener-St"uckelberg interferometry. We show that by initializing the qubit in one of its basis states, performing three consecutive sweeps of the qubit energy splitting across the 1-photon resonance, the parity of the photon field can be purified to very high degree.
  arXiv  Detail & Related papers  (2020-08-27T14:37:57Z)
• A bright and fast source of coherent single photons [46.25143811066789]
  A single photon source is a key enabling technology in device-independent quantum communication. We report a single photon source with an especially high system efficiency.
  arXiv  Detail & Related papers  (2020-07-24T17:08:46Z)
• Weakly invasive metrology: quantum advantage and physical implementations [0.0]
  We show that arbitrarily intense coherent states can obtain information at a rate that scales at most linearly with $N_rm abs$ and $T$. We discuss an implementation in cavity QED, where Fock states are both prepared and measured by coupling atomic ensembles to the cavities.
  arXiv  Detail & Related papers  (2020-06-22T10:14:36Z)
• Near-ideal spontaneous photon sources in silicon quantum photonics [55.41644538483948]
  Integrated photonics is a robust platform for quantum information processing. Sources of single photons that are highly indistinguishable and pure, that are either near-deterministic or heralded with high efficiency, have been elusive. Here, we demonstrate on-chip photon sources that simultaneously meet each of these requirements.
  arXiv  Detail & Related papers  (2020-05-19T16:46:44Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.