International Business Machines Corporation

Srikanth Srinivasan

Kalyan Chakravarthy Gunda

David C Mckay

Abhinav Kandala

Isaac Lauer

William Francis Landers

Neereja Sundaresan

Tejas N Bhise

Systems and techniques that facilitate multi-resonant couplers for preserving ZX interaction while reducing ZZ interaction are provided. In various embodiments, a first qubit can have a first operational frequency and a second qubit can have a second operational frequency, and a multi-resonant architecture can couple the first qubit to the second qubit. In various embodiments, the multi-resonant architecture can comprise a first resonator and a second resonator. In various cases, the first resonator can capacitively couple the first qubit to the second qubit, and a second resonator can capacitively couple the first qubit to the second qubit. In various aspects, the first resonator and the second resonator can be in parallel. In various instances, the first resonator can have a first resonant frequency less than the first operational frequency and the second operational frequency, and the second resonator can have a second resonant frequency greater than the first operational frequency and the second operational frequency. In various other embodiments, the multi-resonant architecture can comprise a resonator, a first end of which can be capacitively coupled to the first qubit and to the second qubit, and a second end of which can be coupled to ground. In various instances, the resonator can have a first harmonic less than the first operational frequency and the second operational frequency, and can have a second harmonic greater than the first operational frequency and the second operational frequency. In various other embodiments, the multi-resonant architecture can comprise a resonator and a direct coupler. In various embodiments, the resonator and the direct coupler can both capacitively couple the first qubit to the second qubit, and the resonator and the direct coupler can be in parallel. In various cases, the direct coupler can couple opposite pads of the first qubit and the second qubit. In various embodiments, a first end of the resonator can be capacitively coupled to the first qubit and the second qubit, a second end of the resonator can be coupled to ground, and the direct coupler can capacitively couple common pads of the first qubit and the second qubit.

Multi-resonant coupling architectures for ZZ interaction reduction

Techniques regarding an embedded microstrip transmission line implemented in one more superconducting microwave electronic devices are provided. For example, one or more embodiments described herein can comprise an apparatus, which can include a superconducting material layer positioned on a raised portion of a dielectric substrate. The raised portion can extend from a surface of the dielectric substrate. The apparatus can also comprise a dielectric film that covers at least a portion of the superconducting material layer and the raised portion of the dielectric substrate.

Embedded microstrip transmission line

A mechanism is provided for cross-allocated block repair in a mounted file system. A set of cross-allocated blocks are identified from a plurality of blocks within an inode of the mounted file system, based on a corresponding bit associated with each cross-allocated block in a duplicated block information bitmap being in a first identified state. The set of cross-allocated blocks are repaired using a user-defined repair process. Then one or more of the set of cross-allocated blocks are deallocated based on results of the user-defined repair process.

Addressing cross-allocated blocks in a file system

A method, computer program product, and apparatus for managing a file system is presented. An object in the file system is identified in which one of a first pointer from the object to a first folder in the file system and a second pointer from the first folder to the object is incorrect. A number of folders is generated within a second folder in the file system that represents a path from a root of the file system to the first folder. The first pointer for the object is set to a last folder in the number of folders in which the last folder represents the first folder.

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Chennai, India

Srikanth Srinivasan