43 citations · 91 across the 29 of their papers we have counts for
20 papers · 1 filter
On the Completeness of Quantum Mechanics: Sources, Records and Probabilities
Mustafa Bakr
Can quantum mechanics be complete without being fundamental? Under stated source, detector, and statistical conditions, we reconstruct the quantum representation and Born probabili…
Constructing and characterising anharmonic potentials in a harmonic oscillator
Clara Yun Fontaine, Mansi Somani, Kehui Yu +9
Continuous-variable quantum systems offer a natural platform for quantum information processing and analogue quantum simulation of real-world processes. Realising these application…
What do position and time mean in the quantum wavefunction?
Mustafa Bakr, Zichi Zhang, Margot Stakenborg
The notation is among the first pieces of quantum mechanics that students learn. It is also among the easiest to over-interpret. Because and occur as arguments of…
Exact Multimode Quantization of Superconducting Circuits via Boundary Admittance and Continued Fractions
Mustafa Bakr, Robin Wopalenski
Accurate extraction of linearized quantum circuit models from electromagnetic simulations is essential for the design of superconducting circuits. We present a quantization framewo…
A Boundary Condition Perspective on Circuit QED Dispersive Readout
Mustafa Bakr
Boundary conditions in confined geometries and measurement interactions in quantum mechanics share a common structural role: both select a preferred basis by determining which stat…
Crosstalk Dispersion and Spatial Scaling in Superconducting Qubit Arrays
Mohammed Alghadeer, Simon Pettersson Fors, Shuxiang Cao +5
Crosstalk between qubits fundamentally limits the scalability of quantum processors, necessitating physics-based models that can handle the complexity of large qubit arrays. Here,…
Quantum Mechanics in a Spherical Wedge: Complete Solution and Implications for Angular Momentum Theory
Mustafa Bakr, Smain Amari
We solve the stationary Schrödinger equation for a particle confined to a 3D spherical wedge -- the region with D…
Double-Bracket Algorithmic Cooling
Mohammed Alghadeer, Khanh Uyen Giang, Shuxiang Cao +6
Algorithmic cooling shows that it is possible to locally reduce the entropy of a qubit belonging to an isolated ensemble such as nuclear spins in molecules or nitrogen-vacancy cent…
Intrinsic Multi-Mode Interference for Passive Suppression of Purcell Decay in Superconducting Circuits
Mustafa Bakr, Mohammed Alghadeer, Simon Pettersson Fors +6
Decoherence due to radiative decay remains an important consideration in scaling superconducting quantum processors. We introduce a passive, interference-based methodology for supp…
Long-Range Entangling Operations via Josephson Junction Metasurfaces
Mustafa Bakr
We present a framework for implementing two-qubit entangling operations between distant superconducting qubits using a space-time modulated Josephson junction metasurface. By modul…
Low Crosstalk in a Scalable Superconducting Quantum Lattice
Mohammed Alghadeer, Shuxiang Cao, Simone D Fasciati +5
Superconducting quantum circuits are a key platform for advancing quantum information processing and simulation. Scaling efforts currently encounter challenges such as Josephson-ju…
Characterization of Nanostructural Imperfections in Superconducting Quantum Circuits
Mohammed Alghadeer, Simone D Fasciati, Shuxiang Cao +7
Decoherence in superconducting quantum circuits, caused by loss mechanisms like material imperfections and two-level system (TLS) defects, remains a major obstacle to improving the…
Multiplexed Readout of Superconducting Qubits Using a 3D Re-entrant Cavity Filter
Mustafa Bakr, Simone D. Fasciati, Shuxiang Cao +7
Hardware efficient methods for high fidelity quantum state measurements are crucial for superconducting qubit experiments, as qubit numbers grow and feedback and state reset begin…
Dynamic Josephson Junction Metasurfaces for Multiplexed Control of Superconducting Qubits
Mustafa Bakr
Scaling superconducting quantum processors to large qubit counts faces challenges in control signal delivery, thermal management, and hardware complexity, particularly in achieving…
Complementing the transmon by integrating a geometric shunt inductor
Simone D. Fasciati, Boris Shteynas, Giulio Campanaro +5
We realize a single-Josephson-junction transmon qubit shunted by a simple geometric inductor. We couple it capacitively to a conventional transmon and show that the ZZ interaction…
Superconducting qubit readout enhanced by path signature
Shuxiang Cao, Zhen Shao, Jian-Qing Zheng +15
Quantum non-demolition measurement plays an essential role in quantum technology, crucial for quantum error correction, metrology, and sensing. Conventionally, the qubit state is c…
Encoding optimization for quantum machine learning demonstrated on a superconducting transmon qutrit
Shuxiang Cao, Weixi Zhang, Jules Tilly +9
Qutrits, three-level quantum systems, have the advantage of potentially requiring fewer components than the typically used two-level qubits to construct equivalent quantum circuits…
Emulating two qubits with a four-level transmon qudit for variational quantum algorithms
Shuxiang Cao, Mustafa Bakr, Giulio Campanaro +7
Using quantum systems with more than two levels, or qudits, can scale the computation space of quantum processors more efficiently than using qubits, which may offer an easier phys…
Efficient characterization of qudit logical gates with gate set tomography using an error-free Virtual-Z-gate model
Shuxiang Cao, Deep Lall, Mustafa Bakr +7
Gate-set tomography (GST) characterizes the process matrix of quantum logic gates, along with measurement and state preparation errors in quantum processors. GST typically requires…
High Coherence in a Tileable 3D Integrated Superconducting Circuit Architecture
Peter A. Spring, Shuxiang Cao, Takahiro Tsunoda +11
We report high qubit coherence as well as low crosstalk and single-qubit gate errors in a superconducting circuit architecture that promises to be tileable to 2D lattices of qubits…