Engineering topics
Sarovar, Mohan
Publications and source records attributed to Sarovar, Mohan.
Optimization Verification and Engineered Reliability of Quantum Computers (OVER-QC).
Abstract not provided.
Optimality of Gaussian receivers for practical Gaussian distributed sensing
Not Available
Smoothing of Gaussian quantum dynamics for force detection
Building on recent work by Gammelmark et al. we develop a formalism for prediction and retrodiction of Gaussian quantum systems undergoing continuous measurements. We apply the resulting formalism to study the advantage of incorporating a full measurement record and retrodiction for impulselike force detection and accelerometry. Here, we find that using retrodiction can only increase accuracy in a limited parameter regime, but that the reduction in estimation noise that it yields results in better detection of impulselike forces.
Fundamental limits to single-photon detection determined by quantum coherence and backaction
Single-photon detectors have achieved impressive performance and have led to a number of new scientific discoveries and technological applications. Existing models of photodetectors are semiclassical in that the field-matter interaction is treated perturbatively and time-separated from physical processes in the absorbing matter. An open question is whether a fully quantum detector, whereby the optical field, the optical absorption, and the amplification are considered as one quantum system, could have improved performance. Here we develop a theoretical model of such photodetectors and employ simulations to reveal the critical role played by quantum coherence and amplification backaction in dictating the performance. Here, we show that coherence and backaction lead to trade-offs between detector metrics and also determine optimal system designs through control of the quantum-classical interface. Importantly, we establish the design parameters that result in a ideal photodetector with 100% efficiency, no dark counts, and minimal jitter, thus paving the route for next-generation detectors.
Engineering Vibrationally Assisted Energy Transfer in a Trapped-Ion Quantum Simulator
Not Available
Detecting Drift Change and Context Dependence in Qubit Experiments.
Abstract not provided.
Fundamental limits to single photodetection determined by quantum coherence and backaction.
Abstract not provided.
Transceivers and receivers for quantum key distribution and methods pertaining thereto
Various technologies for performing continuous-variable (CV) and discrete-variable (DV) quantum key distribution (QKD) with integrated electro-optical circuits are described herein. An integrated DV-QKD system uses Mach-Zehnder modulators to modulate a polarization of photons at a transmitter and select a photon polarization measurement basis at a receiver. An integrated CV-QKD system uses wavelength division multiplexing to send and receive amplitude-modulated and phase-modulated optical signals with a local oscillator signal while maintaining phase coherence between the modulated signals and the local oscillator signal.
Classifying and diagnosing crosstalk in quantum information processors.
Abstract not provided.