Papers

Joseph Bowles, David Wierichs, Chae-Yeun Park·Jun 26, 2023

The discovery of the backpropagation algorithm ranks among one of the most important moments in the history of machine learning, and has made possible the training of large-scale neural networks through its ability to compute gradients at roughly the...

S. A. Yadavalli, I. Marvian·Jun 25, 2023

We study quantum networks with tree structures, in which information propagates from a root to leaves. At each node in the network, the received qubit unitarily interacts with fresh ancilla qubits, after which each qubit is sent through a noisy chann...

G. Saxena, A. Shalabi, T. Kyaw·Jun 22, 2023

The variational quantum imaginary time evolution algorithm is efficient in finding the ground state of a quantum Hamiltonian. This algorithm involves solving a system of linear equations in a classical computer and the solution is then used to propag...

Iosifina Angelidi, M. Szyniszewski, A. Pal·Jun 22, 2023

Long-range entangled states are vital for quantum information processing and quantum metrology. Preparing such states by combining measurements with unitary gates opened new possibilities for efficient protocols with finite-depth quantum circuits. Th...

Jiace Sun, Lixue Cheng, Weitang Li·Jun 21, 2023

Achieving chemical accuracy with shallow quantum circuits is a significant challenge in quantum computational chemistry, particularly for near-term quantum devices. In this work, we present a Clifford-based Hamiltonian engineering algorithm, namely C...

D. A. Kulikov, V. Yashin, A. Fedorov +1 more·Jun 19, 2023

The problem of simulatability of quantum processes using classical resources plays a cornerstone role for quantum computing. Quantum circuits can be simulated classically, e.g., using Monte Carlo sampling techniques applied to quasiprobability repres...

Cameron Cianci·Jun 18, 2023

Entanglement purification protocols promise to play a critical role in the future of quantum networks by distributing entanglement across noisy channels. However, only the security of two-way purification protocols have been closely studied. To addre...

Alok Shukla, P. Vedula·Jun 18, 2023

Quantum state preparation involving a uniform superposition over a non-empty subset of n-qubit computational basis states is an important and challenging step in many quantum computation algorithms and applications. In this work, we address the probl...

Shamiul Alam, Dana S. Rampini, Bakhrom G. Oripov +2 more·Jun 17, 2023

Superconducting electronics are among the most promising alternatives to conventional CMOS technology, thanks to the ultra-fast speed and ultra-high energy efficiency of the superconducting devices. Having a cryogenic control processor is also a cruc...

Selçuk Çakmak, Murat Kurt, A. Gençten·Jun 16, 2023

This study proposes and construct a primitive quantum arithmetic logic unit (qALU) based on the quantum Fourier transform (QFT). The qALU is capable of performing arithmetic ADD (addition) and logic NAND gate operations. It designs a scalable quantum...

Gözde Üstün, Andrea Morello, Simon Devitt·Jun 15, 2023

A key requirement for an effective Quantum Error Correction (QEC) scheme is that the physical qubits have error rates below a certain threshold. The value of this threshold depends on the details of the specific QEC scheme, and its hardware-level imp...

Li Yu, Jie Xu, Fuqun Wang +1 more·Jun 15, 2023

Instantaneous two-party quantum computation is a computation process with bipartite input and output, in which there are initial shared entanglement, and the nonlocal interactions are limited to simultaneous classical communication in both directions...

Kyle E. C. Booth·Jun 14, 2023

Due to the limited connectivity of gate model quantum devices, logical quantum circuits must be compiled to target hardware before they can be executed. Often, this process involves the insertion of SWAP gates into the logical circuit, usually increa...

Freya Shah, T. Patti, Oriol Rubies-Bigorda +1 more·Jun 14, 2023

Photon-mediated interactions in subwavelength atomic arrays have numerous applications in quantum science. In this manuscript, we explore the potential of three-level quantum emitters, or ``impurities"embedded in a two-dimensional atomic array to ser...

D. Litinski·Jun 14, 2023

We use Shor's algorithm for the computation of elliptic curve private keys as a case study for resource estimates in the silicon-photonics-inspired active-volume architecture. Here, a fault-tolerant surface-code quantum computer consists of modules w...

S. Patomäki, M. Gonzalez-Zalba, M. Fogarty +3 more·Jun 13, 2023

We propose a quantum processor architecture, the qubit ‘pipeline’, in which run-time scales additively as functions of circuit depth and run repetitions. Run-time control is applied globally, reducing the complexity of control and interconnect resour...

Mathias Weiden, Ed Younis, Justin Kalloor +2 more·Jun 9, 2023

In the Noisy Intermediate Scale Quantum (NISQ) era, finding implementations of quantum algorithms that mini-mize the number of expensive and error prone multi-qubit gates is vital to ensure computations produce meaningful outputs. Unitary synthesis, ...

Fangfang Du, Gang Fan, Xueqin Ren·Jun 9, 2023

The decoherence effect caused by the coupling between the system and the environment undoubtedly leads to the errors in efficient implementations of two (or three) qubit logical gates in quantum information processing. Fortunately, decoherence-free s...

Joris Kattemolle, S. Hariharan·Jun 8, 2023

Quantum computers have the potential to outperform classical computers, but are currently limited in their capabilities. One such limitation is the restricted connectivity between qubits, as captured by the hardware's coupling graph. This limitation ...

Petros Stougiannidis, Jonas Stein, David Bucher +3 more·Jun 8, 2023

Many promising applications of quantum computing with a provable speedup center around the HHL algorithm. Due to restrictions on the hardware and its significant demand on qubits and gates in known implementations, its execution is prohibitive on nea...