Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session V10: Reservoir Engineering in Superconducting Quantum SystemsInvited Live
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Sponsoring Units: DAMOP Chair: Erich Mueller, Cornell University |
Thursday, March 18, 2021 3:00PM - 3:36PM Live |
V10.00001: Photon-assisted electron tunnelling for environment engineering superconducting circuits Invited Speaker: Vasilii Sevriuk The effort in superconducting electronics is rising due to the demand of high-precision devices and the possibility to employ quantum effects for the purpose of detection, computing, and communication. Environment engineering is a powerful tool not only to improve the characteristics of such devices but also to study open quantum systems. To access these phenomena, we recently invented a quantum-circuit refrigerator (QCR) [1] which is based on the electron tunneling through the superconductor–insulator–normal-metal junctions. In this talk, I will give a brief overview of the recent research related to the QCR. This device not only enables us to cool down a superconducting circuit, but also to employ it as a photon source [2] or as a fast reset tool for the linear resonators and qubits [3]. Interestingly, the QCR allows us to control and to study fundamental physics phenomena such as the Lamb shift [4]. We theoretically predict that a replacement of the normal-metal island of the QCR with a quantum dot may lead to a narrow-band amplifier and an analogue of a maser. I will also describe some details related to the implementation of such a device for its practical utilization. |
Thursday, March 18, 2021 3:36PM - 4:12PM Live |
V10.00002: Autonomous error correction with pair-cat codes Invited Speaker: Victor Albert We introduce a driven-dissipative two-mode bosonic system whose reservoir causes simultaneous loss of two photons in each mode and whose steady states are superpositions of pair-coherent/Barut-Girardello coherent states. We show how quantum information encoded in a steady-state subspace of this system is exponentially immune to phase drifts (cavity dephasing) in both modes. Additionally, it is possible to protect information from arbitrary photon loss in either (but not simultaneously both) of the modes by continuously monitoring the difference between the expected photon numbers of the logical states. Despite employing more resources, the two-mode scheme enjoys two advantages over its one-mode cat-qubit counterpart with regards to implementation using current circuit QED technology. First, monitoring the photon number difference can be done without turning off the currently implementable dissipative stabilizing process. Second, a lower average photon number per mode is required to enjoy a level of protection at least as good as that of the cat-codes. We discuss circuit QED proposals and current experiments to stabilize the code states, perform gates, and protect against photon loss via either active syndrome measurement or an autonomous procedure. We introduce quasiprobability distributions allowing us to represent two-mode states of fixed photon number difference in a two-dimensional complex plane, instead of the full four-dimensional two-mode phase space. |
Thursday, March 18, 2021 4:12PM - 4:48PM Live |
V10.00003: Engineered Dissipation as a Resource in Superconducting Circuits Invited Speaker: Eliot Kapit In this talk, I review exciting experimental and theoretical developments in using dissipation in superconducting circuits as a productive resource instead of just an obstacle to be minimized. These include advances in rapid qubit reset operations, state stabilization and many-body physics simulation, quantum annealing, and quantum error correction. Here, engineered dissipation can be used to generate and stabilize a logical state manifold, or even autonomously correct errors. While dissipation in superconducting qubits contributes significantly to gate error and it remains an important problem, more broadly, its numerous beneficial applications may lead to it playing an important role in large-scale quantum devices down the road. |
Thursday, March 18, 2021 4:48PM - 5:24PM Live |
V10.00004: Error correction of logical quantum bits encoded in a superconducting cavity Invited Speaker: Michel Devoret The accuracy of logical operations on quantum bits (qubits) must be improved for quantum computers to surpass classical ones in useful tasks. To that effect, quantum information must be robust to noise that affects the underlying physical system. Rather than suppressing noise, quantum error correction aims at preventing it from causing logical errors. This approach derives from the reasonable assumption that noise is local: it does not act in a coordinated way on different parts of the physical system. Therefore, if a logical qubit is encoded non-locally, it is possible, during a limited time, to detect and correct noise-induced evolution before it corrupts the encoded information. We will discuss how recent experiments [1, 2] based on superconducting cavities and transmon artificial atoms - employed here as ancillary non-linear elements - realize this error correction, and its prospect for reservoir engineering implementations. |
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