Bulletin of the American Physical Society
50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 64, Number 4
Monday–Friday, May 27–31, 2019; Milwaukee, Wisconsin
Session J08: Quantum Optics |
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Chair: Paul Lett, JQI, NIST and the University of Maryland Room: Wisconsin Center 103C |
Wednesday, May 29, 2019 10:30AM - 10:42AM |
J08.00001: Complete characterization of bright entangled twin beams with analysis cavity method Gaurav Nirala, Marcelo Martinelli, Paulo Nussenzveig, Alberto M. Marino The ability to perform a complete and accurate characterization of a quantum state is a fundamental problem in quantum information science. However, for continuous-variable (CV) Gaussian states, the standard measurement technique, homodyne detection, does not provide a complete characterization. This technique cannot access certain correlations present in a field, which are implicitly assumed to be zero in most quantum state reconstruction experiments. Given the unique role that CV quantum states play in precision measurements and quantum information science and the fact that they can be readily generated in a deterministic way in the laboratory, it is important to develop techniques that can accurately characterize them. Here we report on measurements performed with an analysis cavity that can provide a complete reconstruction of the covariance matrix for entangled twin beams generated with a four-wave mixing process in rubidium vapor. In particular, we show that there are off-diagonal elements in the covariance matrix that prove the presence of the correlations that are not accessible with homodyne detection. [Preview Abstract] |
Wednesday, May 29, 2019 10:42AM - 10:54AM |
J08.00002: Experimental Investigation of Four-Wave Mixing in Hot Sodium Vapor Cells Qimin Zhang, Saesun Kim, Matthew Peters, Alberto M. Marino, Arne Schwettmann Non-degenerate four-wave mixing (4WM) in a hot atomic vapor cell has been shown to be an effective method to produce quantum squeezed states of light. These quantum states have important applications in quantum technologies, such as quantum-enhanced sensing and quantum information processing. Most of the recent work on squeezed light has focused on Rb and Cs in the infrared regime. Generating squeezed light near the Na resonance at 589 nm is challenging but beneficial for interfacing with cold gases and atomic sensors based on Na. We experimentally investigate 4WM in a double-$\Lambda$ configuration on the Doppler-broadened D1 line of $^{23}$Na. We present our work on the characterization of the 4WM gain and noise properties of the intensity difference between the generated beams of light. [Preview Abstract] |
Wednesday, May 29, 2019 10:54AM - 11:06AM |
J08.00003: Generation of Narrowband Bright Single-Mode Squeezed Light through Feedforward Saesun Kim, Alberto M. Marino Squeezed states of light have received renewed attention recently due to their applicability to quantum-enhanced sensing. In order to take full advantage of the reduced noise properties of squeezed light to enhance sensors based on atomic systems, such as atomic magnetometers and atomic interferometers, it is necessary to generate near or on atomic resonance single-mode squeezed states of light. We have previously generated bright two-mode squeezed states of light, or twin beams, that can be tuned to resonance with the D1 line of $^{87}$Rb with a nondegenerate four-wave mixing (FWM) process in a double-lambda configuration in a $^{85}$Rb vapor cell. Here we report on the use of feedforward to transfer the intensity quantum correlations present in the twin beams to a single beam for the generation single-mode squeezed light. Through the use of this technique, we obtained a single-mode squeezed state with an intensity squeezing level of 2.9 dB when the FWM is tuned off-resonance and a level of 2.1 dB when it is tuned on resonance with the D1 $F=2$ to $F′=2$ transition of $^{87}$Rb. [Preview Abstract] |
Wednesday, May 29, 2019 11:06AM - 11:18AM |
J08.00004: Demonstration of narrowband biphotons with sub-MHz bandwidth from low-optical-depth atomic ensemble Ravikumar Chinnarasu, Yi-Feng Ding, Chi-Yang Liu, Chih-Sung Chuu Biphotons of narrow bandwidth and long temporal length have potential applications in realizing efficient light-matter interface and quantum communication. However, generation of these photons usually requires atomic ensembles with high optical depth or spontaneous parametric down-conversion with delicate optical cavities. We propose and demonstrate narrowband biphotons with sub-MHz bandwidth using detuned four-wave mixing in low-optical-depth atomic ensemble. The bandwidth of the biphotons is only limited by the ground-state decoherence rate. We also demonstrate the potential of shaping these photons. [Preview Abstract] |
Wednesday, May 29, 2019 11:18AM - 11:30AM |
J08.00005: High-Efficiency Time-Multiplexed Single-Photon Source Colin P. Lualdi, Fumihiro Kaneda, Joseph C. Chapman, Paul G. Kwiat A single-photon source capable of on-demand generation of indistinguishable single- and multi-photon states is a key requirement for optical quantum information processing (QIP) applications. While heralded single-photon sources (HSPSs) via spontaneous parametric down-conversion have long served this purpose, they are not suitable for large-scale QIP due to their probabilistic nature. As a solution, we utilize time-multiplexing techniques by pairing an adjustable delay line with our low-loss HSPS generating highly indistinguishable ($\sim 90\%$) photons. We report our most current results, which include a $66.7 \pm 2.4 \%$ presence probability of single-photon states collected into a single-mode optical fiber by multiplexing 40 periodic time bins, a $10\times$ enhancement over the non-multiplexed case. We also discuss ongoing efforts to improve multiplexing performance by suppressing the second-order correlation function $g^{(2)}(t=0)$ via increasing the efficiency and photon-number-resolving capabilities of our heralding detectors. Overall, we believe our results present a compelling case for the use of time-multiplexing techniques with HSPSs to enable large-scale optical QIP. [Preview Abstract] |
Wednesday, May 29, 2019 11:30AM - 11:42AM |
J08.00006: Systems of Coupled Dissipative Jaynes-Cummings Cavities Dean Rye, Seth Rittenhouse In this talk we consider a many-cavity Jaynes-Cummings model in which each cavity is coupled to the environment through drive and dissipation. We examine how the bistable behavior of a single cavity extends to a system of weakly interacting cavities, and the emergence of symmetry-breaking steady states within the bistable regime. Numerical solutions to the Lindblad master equation are compared to the bistable solutions produced from semiclassical equations. Quantum trajectory calculations demonstrate switching between symmetry-breaking and symmetry-preserving states. We then use semiclassical mean field approximations to examine how the bistable and symmetry-breaking behavior changes when the single and several cavity model are extended to a many body model. [Preview Abstract] |
Wednesday, May 29, 2019 11:42AM - 11:54AM |
J08.00007: Quantum Entanglement in two-atom and two-photon system Samina Masood We study the entanglement in a two-atom and two-photon system using second quantization in JC ( Jaynes-Cummings) model. Time evolution in the JC- model and the resonant and non-resonant subcases are studied as well. . [Preview Abstract] |
Wednesday, May 29, 2019 11:54AM - 12:06PM |
J08.00008: Testing macroscopic realism with nonlinear beam splitters and Bell inequalities in time Margaret Reid, Laura Rosales-Zarate, Lisa Drummond, Manushan Thenabadu It remains a challenge to falsify macroscopic realism in the sense identified by Leggett and Garg. A difficulty has been justifying a second premise, called macroscopic noninvasive measurability. Here, we consider two dynamically evolving entangled cat-systems prepared at spatially separated locations. A measurement can be made on each cat-system that at any time will give one of two mesoscopically (or macroscopically) distinct outcomes. We show how such an evolution is realisable from a nonlinear beam splitter, using a well-known two-mode Josephson nonlinear Hamiltonian. Importantly, we then show how a rigorous test of mesoscopic (macroscopic) realism can be carried out, with the additional assumption of macroscopic locality. This circumvents difficulties associated with traditional Leggett-Garg tests of macroscopic reality, based on the noninvasive measurement assumption. In our gedanken experiment, there are two measurement choices at each location corresponding to different times, contrasting with the choice of two spin angles in a traditional Bell experiment. We discuss how the proposal gives the opportunity for intriguing tests of quantum mechanics involving nonlocality and time. The experiment might be realised using matter waves or Bose-Einstein condensates. [Preview Abstract] |
Wednesday, May 29, 2019 12:06PM - 12:18PM |
J08.00009: Observation of quantum correlation near the exceptional points Xingda Lu, Wanxia Cao, Xin Meng, Jian Sun, Heng Shen, Yanhong Xiao Recent advances on parity-time symmetric and anti-symmetric optical systems have led to numerous novel optical phenomena and applications. However, quantum statistics of light has not been experimentally studied in such systems. For the first time, we observe quantum correlations in an anti-symmetric optical systems made of flying atoms. Two optical channels, which are dissipatedly coupled, display gain, phase sensitivity and even quantum discord, despite the linear atom-light interaction within each channel. It is found that the discord has a relatively sharp change near the exceptional point. This work provides a new approach to perform nonlinear optics with linear systems by using dissipative coupling, and will open up new directions for non-Hermitian optics. [Preview Abstract] |
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