In this talk I'll cover the first experimental demonstration of a holistic quantum-enabled communications scheme with the record energy efficiency using time-resolving quantum receivers. I'll also discuss single-shot confidences obtained for individual quantum measurements in the state identification problem.
A brief description of tissue optics, concept of ‘tissue optical windows’ and method of optical clearing (OC) based on controllable and reversible modification of tissue optical properties by their impregnation with a biocompatible optical clearing agent (OCA) will be done. Fundamentals and major mechanisms of OC allowing one to enhance optical imaging facilities and laser treatment efficiency of living tissues will be presented. The enhancement of probing/treatment depth and image contrast for a number of human and animal tissues investigated by using different optical modalities, including diffuse reflectance spectroscopy, collimated transmittance, OCT, photoacoustic microscopy, linear and nonlinear fluorescence, SHG and Raman microscopies will be discussed. Experimental data on the diffusion and permeability coefficients of biocompatible FDA approved OCAs, such as glucose, glycerol, PEG, albumin, CT contrast agents (Iohexol (OmnipaqueTM) and Iodixanol (VisipaqueTM)), and MRI contrast agents (Gadobutrol (GadovistTM)) in normal and pathological tissues (cancer and diabetes) will be presented. Perspectives of immersion optical clearing/contrasting technique aiming to enhance imaging of living tissues by using different imaging modalities working in the ultra-broad wavelength range will be discussed.
In my talk I am going to discuss some principle advantages which may be obtained with bright solitons for quantum metrology purposes. To be more specific I am focusing on matter-wave (Bose-Einstein condensate) solitons which can be used in this case. The linear and nonlinear metrology approaches will be discussed. I will show that bright quantum solitons provide a unique opportunity to achieve Super Heisenberg scaling (1/N^(3/2)) for phase estimation procedure even with coherent probes. I will show how further improvement of the phase estimation accuracy may be achieved by means of newly proposed soliton Josephson junction (SJJ) device, which consists of two weakly-coupled soliton-shape condensates. The formation of specific entangled Fock state superposition is predicted and examided in details for established quantum SJJ-model. We have shown that the obtained quantum state is more resistant to moderate particle losses in current metrological schemes with phase measurement and estimation.
In this seminar we will discuss the role played by different optical degrees of freedom (DoF) in nonlinear wave mixing with structured light. First, we define the spin-orbit separability in classical optics and its formal connection with entangled states in Quantum Mechanics. Then we will approach the interplay between these DoF in nonlinear wave mixing.
After a brief tutorial on the quantum parameter estimation formalism we are going to review some recent results on the limits of quantum sensing in noisy scenarios and the capabilities of quantum control.
Quantum technology employs the ‘spooky’ phenomena of quantum physics such as superposition, randomness and entanglement to process information in a novel way. Quantum photonics provides a promising path for both delivering quantum-enhanced technologies and exploring fundamental physics. In this talk, I will introduce our recent work on quantum delayed-choice experiment based on multiphoton entangled states, which shows that a photon can not only be a particle or wave, but the superposition of them, even under Einstein’s locality condition. In the second part of my talk, I will present our recent endeavors in developing functional nodes for quantum information processing based on integrated optics architecture and their potential applications in a metropolitan fiber network.
The measurement of minuscule forces and displacements with ever greater precision is inhibited by the Heisenberg uncertainty principle, which imposes a the standard quantum limit (SQL). The way to surpass SQL is by introducing correlations between the position/momentum uncertainty of the object and the photon number/phase uncertainty of the light that it reflects. Authors confirm experimentally the theoretical prediction that this type of quantum correlation is naturally produced in the Laser Interferometer Gravitational-wave Observatory (LIGO). They characterize and compare noise spectra taken without squeezing and with squeezed vacuum states injected at varying quadrature angles. After subtracting classical noise, measurements show that the quantum mechanical uncertainties in the phases of the 200-kilowatt laser beams and in the positions of the 40-kilogram mirrors of the Advanced LIGO detectors yield a joint quantum uncertainty that is a factor of 1.4 (3 decibels) below the standard quantum limit. Authors anticipate that the use of quantum correlations will improve not only the observation of gravitational waves, but also more broadly future quantum noise-limited measurements.
As an important candidate for quantum simulation and quantum computation, a microscopic array of single atoms confined in optical dipole traps is advantageous in controlled interaction, long coherence time and scalability of providing thousands of qubits in a small footprint of less than 1mm$^2$. Recently, several breakthroughs have greatly advanced the application of neutral atom system in quantum simulation and quantum computation, such as atom-by-atom assembling of defect-free arbitrary atomic arrays, single qubit addressing and manipulating in 2D and 3D array, extending coherence time of atomic qubits, C-NOT gate based on Rydberg interactions, high fidelity readout and so on.
In this talk, the experimental progress towards quantum computation based on neutral atoms is reviewed, along with several contributions done by our group.
First, a magic-intensity trapping technique is developed to mitigate the detrimental decoherence effects which is induced by light shift, and substantially enhanced the coherence time to 225 ms which have improved our previous coherence time by a factor of 100. This technique is later used to improve the single qubit opeartion fidelity to over 0.9999.
Second, the difference in the resonant frequencies of the two atoms of different isotopes is exploited to avoid the crosstalk of individually addressing and manipulating nearby atoms. Based on this heteronuclear single atom system, the heteronuclear controlled-NOT (CNOT) quantum gate and entanglement of a Rb-85 atom and a Rb-87 atom is demonstrated via Rydberg blockade for the first time. These results will trigger the quest for new protocols and schemes to use the double species for quantum computation with neutral atoms.
In the end, the challenges for further development of neutral atom system in quantum simulation and quantum computation are outlooked.
