Quantum Engineering Colloquium


1. Lei Xie,  TU Delft, The Netherlands -- 04-10-2017

2. Milad Mehrpoo, TU Delft, The Netherlands -- 04-10-2017


 1. Scouting Logic: A Novel Memristor-Based Logic Design for Resistive Computing

Memristor technology is a promising alternative to CMOS due to its high integration density, near-zero standby power, and ability to implement novel resistive computing. One of the major limitations of these architectures is the limited endurance of memristor devices, especially when a logic gate requires multiple steps/switching to execute the logic operations. To alleviate the endurance requirement and improve the performance, we present a novel logic design style, called scouting logic that executes any logic gate by only reading the memristor devices and without changing their states. Hence, no impact on the memristors’ endurance. The proposed design is implemented using two styles (current and voltage based). To illustrate the performance of scouting logic based designs, the area, delay, and power consumption are analyzed and compared with state-ofthe- art. The results show that scouting logic improves the delay and power consumption by at least a factor of 2.3, while having similar or less area overhead. Finally, we discuss the potential applications and challenges of scouting logic.

2. System Analysis of a (Cryo)-RFIC for Superconducting Qubits Readout

Currently, the solid-state superconducting qubits are operated below 20 mK and their control and readout operations are typically performed using commercial-off-the-shelf electronics instruments, operating at the room-temperature. To allow for scalability, an active area of research is to replace the electronics instruments with more customized platforms or even RF integrated circuits (RFIC), preferably based on the CMOS technology, operating at cryogenic temperatures. Due to the restricted power consumption budgets at cryogenic temperatures, it becomes important to identify the system-level trade-offs in the electronics and its impact on the qubit fidelity, to be able to implement practical and power efficient (cryogenic) RFICs.

In this work, we focus on the understanding of the readout operation and the analysis of the corresponding electronics chain for the transmons within the circuit QED framework. Through simulating the quantum trajectories, we analyze a demonstrative case of a single-qubit high-fidelity, single-shot readout and derive the design requirements of the readout chain components such as the RF amplifiers gain and noise distribution, ADC speed and resolution, the matched filter etc.


Lei Xie received his Bachelor’s and Master’s degree in China. Now he is pursuing a PhD at the Computer Engineering Lab in TU Delft. His research interest is memristor-based logic circuit design.

Milad Mehrpoo received the B.Sc. degree in Electrical Engineering from Tehran University, Iran, in 2010, and the M.Sc. (cum laude) degree in Microelectronics from Delft University of Technology in 2012. He was an RF System and Circuit Architect with Catena Microelectronics, Delft, from 2012 to 2015. He started his Ph.D. degree in 2015 at TU Delft, microelectronics department. Since March 2017, he has joined Edoardo Charbon's team in Q&CE department, pursuing his Ph.D. research on cryogenic electronics for quantum computations under the supervision of Masoud Babaie. He is currently working on the development of a cryogenic CMOS chip for the readout of superconducting qubits.




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