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Physics

Quantum information science

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Displaying 101 - 125 of 922

Systematic Improvements in Transmon Qubit Coherence enabled by Niobium Surface Encapsulation

June 14, 2023
Author(s)
Mustafa BAL, Akshay Murthy, Francesco Crisa, Shaojiang Zhu, Florent Lecocq, Joe Aumentado, Joel Ullom, Pete Hopkins
We present a novel transmon qubit fabrication technique that yields systematic improvements in T1 coherence times. In this study, the devices are fabricated using a novel encapsulation strategy that involves passivating the surface of niobium and thereby

Applications of single photons in quantum metrology, biology and the foundations of quantum physics

May 26, 2023
Author(s)
Christophe Couteau, Stefanie Barz, Thomas Durt, Thomas Gerrits, Jan Huwer, Robert Prevedel, John Rarity, Gregor Weihs
With the development of photonic quantum technologies, single photons have become key for various applications including quantum communication and quantum computing, discussed in an accompanying Review. Here we overview the applications of single photons

Nonlinear Sideband Cooling to a Cat State of Motion

May 25, 2023
Author(s)
Bradley Hauer, Joshua Combes, John Teufel
The ability to prepare a macroscopic mechanical resonator into a quantum superposition state is an outstanding goal of cavity optomechanics. Here, we propose a technique to generate cat states of motion using the intrinsic nonlinearity of a dispersive

Automated extraction of capacitive coupling for quantum dot systems

May 24, 2023
Author(s)
Joshua Ziegler, Florian Luthi, Mick Ramsey, Felix Borjans, Guoji Zheng, Justyna Zwolak
Gate-defined quantum dots (QDs) have appealing attributes as a quantum computing platform. However, near-term devices possess a range of possible imperfections that need to be accounted for during the tuning and operation of QD devices. One such problem is

Neural-network decoders for measurement induced phase transitions

May 22, 2023
Author(s)
Hossein Dehghani, Ali Lavasani, Mohammad Hafezi, Michael Gullans
Open quantum systems have been shown to host a plethora of exotic dynamical phases. Measurement-induced entanglement phase transitions in monitored quantum systems are a striking example of this phenomena. However, naive realizations of such phase

Experimental demonstration of local area entanglement distribution between two distant nodes, coexisting with classical synchronization

May 12, 2023
Author(s)
Anouar Rahmouni, Paulina Kuo, Yicheng Shi, Jabir Marakkarakath Vadakkepurayil, Nijil Lal Cheriya Koyyottummal, Ivan Burenkov, Ya-Shian Li-Baboud, Mheni Merzouki, Abdella Battou, Sergey Polyakov, Oliver T. Slattery, Thomas Gerrits
We successfully demonstrated polarization entanglement distribution and classical time synchronization using a high-accuracy precision time protocol between two quantum nodes located 250 meters apart using a single fiber simultaneously carrying both

Sub-200 ps Quantum Network Node Synchronization over a 128 km Link White Rabbit Architecture

May 12, 2023
Author(s)
Wayne McKenzie, Ya-Shian Li-Baboud, Mark Morris, Gerald Baumgartner, Anouar Rahmouni, Paulina Kuo, Oliver T. Slattery, Bruce Crabill, Mheni Merzouki, Abdella Battou, Thomas Gerrits
We show sub-200 ps synchronization between quantum networks nodes that are separated by two 64 km deployed fiber links, providing a 128 km link architecture. The architecture employs one grandmaster and two boundary White Rabbit system clocks and shows

Versatile parametric coupling between two statically decoupled transmon qubits

May 4, 2023
Author(s)
Xiaoyue Jin, Zachary Parrott, SHLOMI KOTLER, Katarina Cicak, Florent Lecocq, John Teufel, Joe Aumentado, Raymond Simmonds
Parametric coupling is a powerful technique for generating tunable interactions between superconducting circuits using only microwave tones. Here, we present a highly flexible parametric coupling scheme demonstrated with two transmon qubits, which can be

Trap-Integrated Superconducting Nanowire Single-Photon Detectors with Improved RF Tolerance for Trapped-Ion Qubit State Readout

April 24, 2023
Author(s)
Benedikt Hampel, Daniel Slichter, Dietrich Leibfried, Richard Mirin, Sae Woo Nam, Varun Verma
State readout of trapped-ion qubits with trap-integrated detectors can address important challenges for scalable quantum computing, but the strong radio frequency (rf) electric fields used for trapping can impact detector performance. Here, we report on

Symplectic geometry and circuit quantization

April 17, 2023
Author(s)
Andrew Osborne, Trevyn Larson, Sarah Jones, Raymond Simmonds, Andras Gyenis, Andrew Lucas
Circuit quantization is an extraordinarily successful theory that describes the behavior of quantum circuits with high precision. The most widely used approach of circuit quantization relies on introducing a classical Lagrangian whose degrees of freedom

Quantum back-action limits in dispersively measured Bose-Einstein condensates

April 8, 2023
Author(s)
Ian Spielman, Emine Altuntas
A fundamental tenet of quantum mechanics is that measurements change a system's wavefunction to that most consistent with the measurement outcome, even if no observer is present. Weak measurements produce only limited information about the system, and as a

Lower Bounds on Quantum Annealing Times

April 5, 2023
Author(s)
Luis Pedro Garcia-Pintos, Lucas Brady, Jacob Bringewatt, Yi-Kai Liu
The adiabatic theorem provides sufficient conditions for the time needed to prepare a target ground state. While it is possible to prepare a target state much faster with more general quantum annealing protocols, rigorous results beyond the adiabatic

Integrating planar photonics for multi-beam generation and atomic clock packaging on chip

April 3, 2023
Author(s)
Chad Ropp, Wenqi Zhu, Alexander Yulaev, Daron Westly, Gregory Simelgor, Akash Rakholia, William Lunden, Dan Sheredy, Martin Boyd, Scott Papp, Amit Agrawal, Vladimir Aksyuk
The commercialization of atomic technologies requires replacing laboratory-scale laser setups with compact and manufacturable optical platforms. Complex arrangements of free-space beams can be generated on chip through a combination of integrated photonics

Toward improved quantum simulations and sensing with trapped two-dimensional ion crystals via parametric amplification

March 29, 2023
Author(s)
Matthew Affolter, Wenchao Ge, Bryce Bullock, Shaun Burd, Kevin Gilmore, Jennifer Lilieholm, Allison Carter, John J. Bollinger
Improving coherence is a fundamental challenge in quantum simulation and sensing experiments with trapped ions. Here we discuss, experimentally demonstrate, and estimate the potential impacts of two different protocols that enhance, through motional

Synchronization and Coexistence in Quantum networks

March 27, 2023
Author(s)
Ivan Burenkov, Alexandra Semionova, FNU Hala, Thomas Gerrits, Anouar Rahmouni, DJ Anand, Ya-Shian Li-Baboud, Oliver T. Slattery, Abdella Battou, Sergey Polyakov
We investigate the coexistence of clock synchronization protocols with quantum signals in a common single-mode optical fiber. By measuring optical noise between 1500 nm to 1620 nm we demonstrate a potential for up to 100 quantum DWDM channels coexisting

Experimental Ambitions for DC-Area Quantum Network Testbed

March 23, 2023
Author(s)
Oliver T. Slattery, Adam Black
Quantum networks [1] bear the promise of one day enabling diverse applications such as secure communications, distributed quantum computing, distributed sensing, and time distribution, in addition to other applications not yet identified. In recent years

Ultrafast ID-VG Technique for Reliable Cryogenic Device Characterization

March 21, 2023
Author(s)
Pragya Shrestha, Akin Akturk, Brian Hoskins, Advait Madhavan, Jason Campbell
An in-depth understanding of the transient operation of devices at cryogenic temperatures remains experimentally elusive. However, the impact of these transients has recently become important in efforts to develop both electronics to support quantum
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