MS Thesis Defense: Arman Setser
Location
Off Campus : via Webex
Date & Time
July 29, 2020, 1:00 pm – 2:00 pm
Description
ADVISOR: Jason Kestner
TITLE:
Optimized Modular Entangling Sequences for Two-Qubit Entangling
Gates and Adiabatic Pulse Shaping for Capacitively Coupled Hybrid Qubits
Abstract:
Gates and Adiabatic Pulse Shaping for Capacitively Coupled Hybrid Qubits
Abstract:
Implementation of logical entangling gates is an important step towards
realizing a quantum computer. In this work, we theoretically examine the
implementation of two-qubit logical entangling gates in noisy environments. We begin by using a gradient-based optimization approach to find single-qubit rotations which can be interleaved between applications of a noisy nonlocal gate to dramatically suppress arbitrary logical and leakage errors, while steering the evolution operator towards the perfectly entangling subset of SU(4) gates. The modularity of the approach allows for application to any two-qubit system, regardless of the Hamiltonian or details of the experimental implementation. This approach is effective for both quasi-static logical and leakage noise, as well as time-dependent 1/f logical noise. We then examine capacitive coupling between two quantum dot hybrid qubits, each consisting of three electrons in a double quantum dot, as a function of the energy detuning of the double dot potentials. We show that a shaped detuning pulse can produce a two-qubit maximally entangling operation in 50ns without having to simultaneously change tunnel couplings. Simulations of the entangling operation in the presence of experimentally realistic charge noise yield two-qubit infidelities over 90%.
implementation of two-qubit logical entangling gates in noisy environments. We begin by using a gradient-based optimization approach to find single-qubit rotations which can be interleaved between applications of a noisy nonlocal gate to dramatically suppress arbitrary logical and leakage errors, while steering the evolution operator towards the perfectly entangling subset of SU(4) gates. The modularity of the approach allows for application to any two-qubit system, regardless of the Hamiltonian or details of the experimental implementation. This approach is effective for both quasi-static logical and leakage noise, as well as time-dependent 1/f logical noise. We then examine capacitive coupling between two quantum dot hybrid qubits, each consisting of three electrons in a double quantum dot, as a function of the energy detuning of the double dot potentials. We show that a shaped detuning pulse can produce a two-qubit maximally entangling operation in 50ns without having to simultaneously change tunnel couplings. Simulations of the entangling operation in the presence of experimentally realistic charge noise yield two-qubit infidelities over 90%.
WEBEX INFO:
Wednesday, Jul 29, 2020 1:00 pm | 1 hour | (UTC-04:00) Eastern Time (US
& Canada)
Meeting number: 120 701 2218
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Access code: 120 701 2218
Wednesday, Jul 29, 2020 1:00 pm | 1 hour | (UTC-04:00) Eastern Time (US
& Canada)
Meeting number: 120 701 2218
Password: 3FbdqGDaF78
https://umbc.webex.com/umbc/j.php?MTID=mc04f46fd235baeee71b96d0e675cefa8
Join by video system
Dial 1207012218@umbc.webex.com
You can also dial 173.243.2.68 and enter your meeting number.
Join by phone
+1-202-860-2110 United States Toll (Washington D.C.)
Access code: 120 701 2218
