In the past decades, generating single photons on demand with well defined quantum states and detecting them after photon-photon or photon-matter interaction are central to the area of quantum optics and quantum information science. The ability to detect light efficiently at the single photon level offers unprecedented opportunities for a wide range of applications, including long-distance quantum key distribution, light detection and ranging, photonic quantum computing, weak light detection for astronomy and bio-imaging.In the past decades, generating single photons on demand with well defined quantum states and detecting them after photon-photon or photon-matter interaction are central to the area of quantum optics and quantum information science. The ability to detect light efficiently at the single photon level offers unprecedented opportunities for a wide range of applications, including long-distance quantum key distribution, light detection and ranging, photonic quantum computing, weak light detection for astronomy and bio-imaging.

Aug 18, 20211 citation

Monitoring the states of single quantum systems.

Kevin Garapo

Jan 1, 20120 citations

Approaching the Heisenberg Limit without Single-Particle Detection

Emily J. Davis, Gregory S. Bentsen, Monika Schleier-Smith

We propose an approach to quantum phase estimation that can attain precision near the Heisenberg limit without requiring single-particle-resolved state detection. We show that the "one-axis twisting" interaction, well known for generating spin squeezing in atomic ensembles, can also amplify the output signal of an entanglement-enhanced interferometer to facilitate readout. Applying this interaction-based readout to oversqueezed, non-Gaussian states yields a Heisenberg scaling in phase sensitivity, which persists in the presence of detection noise as large as the quantum projection noise of an unentangled ensemble. Even in dissipative implementations-e.g., employing light-mediated interactions in an optical cavity or Rydberg dressing-the method significantly relaxes the detection resolution required for spectroscopy beyond the standard quantum limit.We propose an approach to quantum phase estimation that can attain precision near the Heisenberg limit without requiring single-particle-resolved state detection. We show that the "one-axis twisting" interaction, well known for generating spin squeezing in atomic ensembles, can also amplify the output signal of an entanglement-enhanced interferometer to facilitate readout. Applying this interaction-based readout to oversqueezed, non-Gaussian states yields a Heisenberg scaling in phase sensitivity, which persists in the presence of detection noise as large as the quantum projection noise of an unentangled ensemble. Even in dissipative implementations-e.g., employing light-mediated interactions in an optical cavity or Rydberg dressing-the method significantly relaxes the detection resolution required for spectroscopy beyond the standard quantum limit.

arXiv:1508.04110Physical Review LettersFeb 2, 2016245 citations

Resonator-assisted single-molecule quantum state detection

Ming Yuan Zhu, Yan-Cheng Wei, Chen-Lung Hung

Optical detection of molecules can often be challenging due to the lack of a closed cycling transition. In this paper, the authors explore the use of high- $Q$ cavities and microresonators to increase the interaction time of light with a single molecule. Their technique could potentially also be applied for atoms or other quantum emitters.Optical detection of molecules can often be challenging due to the lack of a closed cycling transition. In this paper, the authors explore the use of high-$Q$ cavities and microresonators to increase the interaction time of light with a single molecule. Their technique could potentially also be applied for atoms or other quantum emitters.

arXiv:2007.04498Physical Review AAug 24, 20204 citations

Manipulation and measurement of quantum states of single spins

Wrachtrup

Conference on Lasers and Electro-OpticsJan 1, 20040 citations

Optical detection of molecules can often be challenging due to the lack of a closed cycling transition. In this paper, the authors explore the use of high-

Q

cavities and microresonators to increase the interaction time of light with a single molecule. Their technique could potentially also be applied for atoms or other quantum emitters.