Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session M11: V: Lasers, Quantum Optics, and Quantum InformationVirtual Only
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Chair: Chih-Chun Chien, University of California, Merced Room: Virtual Platform |
Wednesday, June 7, 2023 2:00PM - 2:12PM |
M11.00001: Rydberg Raman Ramsey EIT Robert J Behary, Irina B Novikova, Eugeniy E Mikhailov, Alexander T Gill, Aaron Buikema Rydberg states of atoms are of interest due to their high electric susceptibility and potential applications for electric field sensors. A common optical detection of Rydberg atoms uses a two photon Electromagnetically induced transparency (EIT) transmission peak as a frequency marker and is achieved by two counter-propagating optical fields at 780 nm and 480 nm. Its sensitivity for atomic vapor is limited by the residual Doppler broadening. Here we theoretically investigate a possibility to boost the sensor response by reducing the resonance width using a temporal and potentially spatial Ramsey interrogation. Two spatially separated EIT channels create a Ramsey sequence where atomic Rydberg coherence is prepared in the first region, evolves with no applied optical fields in a “dark region” between the two channels, and then is probed in the second channel. We show that the linewidth of such a Raman-Ramsey fringe can be theoretically reduced to 50 kHz with room temperature Rydberg atoms. This theoretical work suggests an approach to have a narrow EIT feature with reduced power broadening which could be potentially beneficial for increased sensitivity in EIT-based Rydberg electrometers. Preliminary experimental verification of this theory is in progress. |
Wednesday, June 7, 2023 2:12PM - 2:24PM |
M11.00002: Linear optical and local filtering of entangled states Dov Fields, Vladimir S Malinovsky, Janos A Bergou, Mark Hillery, Brian T Kirby The problem of state discrimination is fundamental to quantum information. From a theoretical perspective, orthogonal quantum states should be perfectly distinguishable. However, we can impose restrictions on the types of operations we allow, making this problem no longer trivial. Two such restrictions are those of linear optics and local measurements. In linear optical systems, the set of allowed operations is limited to those implementable using linear optical components: beam splitters and phase shifters. For local measurements, we focus on multi-partite systems, allowing only local operations on the subsystems. In both cases, we see that these limitations create challenges for the discrimination of orthogonal states. For instance, the set of four Bell states cannot be perfectly discriminated in either case, that of linear optics and that of local measurements. However, in each case there are strategies that allow for the detection of two out of the four states, allowing the discrimination to succeed 50\% of the time. For this talk, we focus on the question of optimal discrimination of any set of basis states of the space of two qubits. Specifically, we provide a general method for optimally filtering at least two of the four states given states, given any of the four states are sent. Our method gives the optimal protocols for both linear optical and local systems simultaneously. |
Wednesday, June 7, 2023 2:24PM - 2:36PM |
M11.00003: Study of EIT width, transmission and group delay in inhomogeneously broadened Λ closed Zeeman EIT system Bharti Bharti, Joyee Ghosh Zeeman electromagnetically induced transparency (EIT) is a phenomenon observed in atomic systems in which the absorption of light at a certain frequency is suppressed by the presence of a second laser beam. In this study, we have investigated the phenomenon of Zeeman electromagnetically induced transparency (EIT) in the D2 line of 87 Rb atoms at room temperature. Our aim is to generate clean signals in a closed system, which is significantly simpler than the standard EIT due to degenerate levels. In this scenario, EIT can be achieved using a single External cavity diode laser (ECDL) source, eliminating the need to phase-lock two separate lasers. We have analyzed the effect of various parameters, such as transit time, cell temperature, coupling intensity, beam diameter and longitudinal magnetic field on the EIT width, peak transmission and group delay. |
Wednesday, June 7, 2023 2:36PM - 2:48PM |
M11.00004: Profiling the Spatial Quantum Fluctuations Charris A Gabaldon, Savannah Cuozzo, Pratik J Barge, Irina B Novikova, Eugeniy Mikhailov, Hwang Lee, Lior Cohen Spatial information of quantum light states is needed for various quantum optics applications such as communication and precision measurements. Squeezed states are of particular interest as noise can be reduced below the shot noise limit. We are developing a protocol for measuring the spatial profiles of such squeezed states. Reconstruction of single spatial squeezed modes is demonstrated and we are expanding the formalism to multimode cases. Our method is based on single pixel imaging techniques adapted to the quantum domain and combining it with homodyne detection. Full wavefront information, phase and amplitude, of the quantum state is extracted via measurement of interferometric contrast of the quantum quadrature variance. To generate a squeezed state, we use polarization self-rotation (PSR) in Rubidium atoms which yields squeezing at 795nm. But our method is agnostic to these specifics and can work with any wavelength that is compatible with the detector used. As a proof of concept, we present quantum squeezed state spatial mode modifications as a function of atomic density. |
Wednesday, June 7, 2023 2:48PM - 3:00PM |
M11.00005: Toward bi-chromatic intensity squeezing at telecom wavelength using FWM (Four Wave Mixing) in Rb vapor Ziqi Niu, Arunaday Gupta, Jianming Wen, Chuanwei Zhang, Irina B Novikova, Shengwang Du Entangled photon pairs and fields are essential for various optical quantum information processing processes, and particularly for quantum teleportation protocols. Distributing entanglement over long distances requires transmitted photons to fall within telecom wavelength bands, and their counterpart to be strongly coupled with local quantum nodes. In this research, we investigate the possibility to generate quantum correlated optical fields satisfying the above-mentioned requirements through the four-wave mixing (FWM) process in hot Rubidium vapor. Using a 4-level double-ladder system in which two strong pump fields drive the system up to 6S1/2 state of Rb85, we observe amplification of a weak seed field at 795nm, as well as the generation of the new field at 1324nm via the FWM gain. We can reach over 10% conversion rate with respect to the weak seed, providing promising conditions for observation of the quantum correlations between these two fields. The high conversion rate is ideal for quantum information applications relying on continuous variable (CV) entangled states. |
Wednesday, June 7, 2023 3:00PM - 3:12PM |
M11.00006: Control of Quantum Coherence via Chirped Fractional Stimulated Raman Adiabatic Passage Jabir Chathanathil, Aneesh Ramaswamy, Svetlana A Malinovskaya Stimulated Raman Adiabatic Passage (STIRAP) is a robust and efficient method for population transfer without any loss due to spontaneous decay. Two-photon resonance is an important condition in STIRAP for the process to be perfectly adiabatic. However, by chirping both pump and Stokes pulses with carefully chosen chirp rates and time delay between them, it is possible to transfer the population adiabatically in the case of non-zero two-photon detuning. It has been found that the population can be flown exclusively to one of the desired levels in a nearly degenerate 4-level system by controlling the sign of chirp rates. Fractional-STIRAP, a variation of STIRAP in which the Stokes pulse overlaps with the pump pulse as they both drop to zero, has been used to create a coherent superposition of the initial and final states adiabatically. This is based on the idea of elongating the Stokes pulse to preserve the populations at half levels and the coherence at maximum. In this work, we apply chirped pulses of pump and Stokes in fractional-STIRAP to create maximally coherent superposition selectively in a nearly degenerate 4-level system. This method provides a way to control the dynamics in systems with close energy levels and allow generation of output signals with optimal intensity in detection and sensing techniques. |
Wednesday, June 7, 2023 3:12PM - 3:24PM |
M11.00007: The impact of a qubit on the optomechanically induced transparency in spinning ring resonators Imran M Mirza, Jessica Burns, Owen Root, Hui Jing In this talk, I'll discuss our recent work (arXiv:2210.07330) on optomechanically induced transparency (OMIT) in spinning ring resonators that are coupled to a single qubit. In the past, we and others have shown that due to the spin degree of freedom of the pump-probe driven optomechanical resonator (Sagnac-effect), non-reciprocal photonic transport and slow & fast light propagation is possible to attain. In this talk, we focus on the scenario when a single qubit is optically coupled to such a hybrid quantum system. In particular, we pay attention to how the interplay between qubit-photon interaction and spinning of the resonator allows engineering OMIT which can find useful applications in developing quantum memories and quantum networking protocols. |
Wednesday, June 7, 2023 3:24PM - 3:36PM |
M11.00008: A programmable system-on-chip-based device for automated control of laser light for cold atom experiments Gabriel Delich, Justin M Craven, Elliott Meeks, Eric Ayars, Hyewon K Pechkis, Joseph A Pechkis We have developed a programmable system-on-chip (PSoC) device shutter controller and arbitrary waveform generator for the control of laser light. This microcontroller-based device with configurable digital and analog blocks is readily reprogrammed using free software, allowing for easy customization for a variety of applications. Additional digital and analog outputs with arbitrary timings can be used to control a variety of devices, such as acousto-optical modulators, additional shutters, or camera trigger pulses, for complete control of optical switching and imaging of laser light. Utilizing TTL-level control signals, this device can be readily integrated into existing computer control and data acquisition systems for expanded hardware capabilities. We report on the performance of this device and its integration into cold atom experiments. |
Wednesday, June 7, 2023 3:36PM - 3:48PM |
M11.00009: Gate control of heavy hole spin in semiconductor quantum dots: Anisotropy effect Sanjay Prabhakar, Joseph Zwiener, Dalton Forbes, Ruma De, Himadri Chakraborty It is a notion that single heavy hole spin in semiconductor quantum dots can be manipulated with the application of electric fields, magnetic fields, and lateral size of the quantum dots. In symmetric heavy hole quantum dots, the spin-hot-spot, where decoherence time is significantly reduced, can be observed for the pure Dresselhaus spin-orbit coupling case and absent for the pure Rashba spin-orbit coupling case. In this poster presentation, we provide analytical and numerical results that show the spin-hot-spot can also be seen for the pure Rashba spin-orbit coupling case by inducing anisotropy through external gates. The results open the new possibilities for the design of a quantum computer based on the electric field control of single heavy hole spins in III-V semiconductor quantum dots. |
Wednesday, June 7, 2023 3:48PM - 4:00PM |
M11.00010: Two-photon quantum gates with a single V-type atom Julio R Gea-Banacloche, Arkan Hassan We show that a single three-level atom in the V configuration can potentially perform an ideal CPHASE gate between two photons, each described by a single mode field, by controlling the interaction time (and, optionally the detuning). The single-mode description would require the operation to take place in a high-finesse cavity in the strong-coupling limit. Getting the field in and out of the cavity while avoiding wavepacket distortion might be accomplished using dynamical coupling techniques, in which case the principal limitation would be the atom's spontaneous emission rate out of the cavity mode. |
Wednesday, June 7, 2023 4:00PM - 4:12PM Withdrawn |
M11.00011: Error-Robust Quantum Signal Processing using Rydberg Atoms Sina Zeytinoglu, Sho Sugiura Rydberg atom arrays have recently emerged as one of the most promising platforms for quantum simulation and quantum information processing. However, as is the case for other experimental platforms, the longer-term success of the Rydberg atom arrays in implementing quantum algorithms depends crucially on their robustness to gate-induced errors. Here we show that, for an idealized biased error model based on Rydberg atom dynamics, the implementation of QSP protocols can be made error-robust, in the sense that the asymptotic scaling of the gate-induced error probability is slower than that of gate complexity. Moreover, using experimental parameters reported in the literature, we show that QSP iterates made out of up to a hundred gates can be implemented with constant error probability. |
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