Generation of non-classical light in a photon-number superposition

Loredo, J. C.; Antón, C.; Reznychenko, B.; Hilaire, Paul; Harouri, A.; Millet, C.; Ollivier, H.; Somaschi, Niccolò; Santis, Lorenzo De; Lemaı̂tre, A.; Sagnes, I.; Lanco, L.; Auffèves, Alexia; Krebs, O.; Senellart, P.

doi:10.1038/s41566-019-0506-3

Cited by 64 publications

(73 citation statements)

References 54 publications

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“…The degradation of the fidelity with increasing amplitude of the Gaussian excitation pulse is due to its rather long 180 ns duration in comparison to the characteristic emission time T p = 80 ns of the source. This leads to a small probability of two-photon emission [37]. When reconstructing the state after a θ = 2π pulse, which would ideally create the vacuum state, we find 6% two-photon population and 4% single photon population.…”

Section: Appendix C: State Reconstruction From Wigner Tomogramsmentioning

confidence: 81%

Parity Detection of Propagating Microwave Fields

et al. 2020

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The parity of the number of elementary excitations present in a quantum system provides important insights into its physical properties. Parity measurements are used, for example, to tomographically reconstruct quantum states or to determine if a decay of an excitation has occurred, information which can be used for quantum error correction in computation or communication protocols. Here we demonstrate a versatile parity detector for propagating microwaves, which distinguishes between radiation fields containing an even or odd number n of photons, both in a single-shot measurement and without perturbing the parity of the detected field. We showcase applications of the detector for direct Wigner tomography of propagating microwaves and heralded generation of Schrödinger cat states. This parity detection scheme is applicable over a broad frequency range and may prove useful, for example, for heralded or fault-tolerant quantum communication protocols. * jbesse@phys.ethz.ch † Current address: Quantum Technology Laboratory, Chalmers University of Technology, SE-412 96 Gteborg, Sweden qubits for measurement based entanglement generation [13], for elements of error correction [14][15][16], and entanglement stabilization [17], an experiment which was also performed with ions [18,19].

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Section: Appendix C: State Reconstruction From Wigner Tomogramsmentioning

confidence: 81%

Parity Detection of Propagating Microwave Fields

et al. 2020

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“…Different paths are being developed to solve this general bottleneck in quantum technology when cascaded operations are performed. Better synchronization of heralded probabilistic resources, as implemented in recent works with high state purity (34,35), or extension of quantum state engineering and of the hybrid approach to on-demand non-Gaussian sources (36,37) are promising directions. Implementations at telecom wavelength, or with dual frequencies, would also be possible given the current developments of efficient squeezers in this regime (38).…”

Section: Discussionmentioning

confidence: 99%

Connecting heterogeneous quantum networks by hybrid entanglement swapping

et al. 2020

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Recent advances in quantum technologies are rapidly stimulating the building of quantum networks. With the parallel development of multiple physical platforms and different types of encodings, a challenge for present and future networks is to uphold a heterogeneous structure for full functionality and therefore support modular systems that are not necessarily compatible with one another. Central to this endeavor is the capability to distribute and interconnect optical entangled states relying on different discrete and continuous quantum variables. Here, we report an entanglement swapping protocol connecting such entangled states. We generate single-photon entanglement and hybrid entanglement between particle- and wave-like optical qubits and then demonstrate the heralded creation of hybrid entanglement at a distance by using a specific Bell-state measurement. This ability opens up the prospect of connecting heterogeneous nodes of a network, with the promise of increased integration and novel functionalities.

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“…Single-photon sources have been engineered for a variety of different platforms [17][18][19][20][21]. Moreover, propagating pure superpositions of vacuum, single and two-photons have been generated in superconducting circuits [22] and with quantum dots [23]. All of these setups have in common that they use pulsed excitation.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of Wigner negativity in one-dimensional steady-state resonance fluorescence

Strandberg

Quijandría

et al. 2019

Phys. Rev. A

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In a numerical study, we investigate the steady-state generation of nonclassical states of light from a coherently driven two-level atom in a one-dimensional waveguide. Specifically, we look for states with a negative Wigner function, since such nonclassical states are a resource for quantum information processing applications, including quantum computing. We find that a waveguide terminated by a mirror at the position of the atom can provide Wigner-negative states, while an infinite waveguide yields strictly positive Wigner functions. Moreover, our investigation reveals a connection between the purity of a quantum state and its Wigner negativity. We also analyze the effects of decoherence on the negativity of a state.

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Generation of non-classical light in a photon-number superposition

Cited by 64 publications

References 54 publications

Parity Detection of Propagating Microwave Fields

Parity Detection of Propagating Microwave Fields

Connecting heterogeneous quantum networks by hybrid entanglement swapping

Numerical study of Wigner negativity in one-dimensional steady-state resonance fluorescence

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