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Cloud-based quantum computers have become a re- ality with a number of companies allowing for cloud-based access to their machines with tens to more than 100 qubits. With easy access to quantum computers, quantum information processing will potentially revolutionize computation, and superconducting transmon-based quantum computers are among some of the more promising devices available. Cloud service providers today host a variety of these and other prototype quantum computers with highly diverse device properties, sizes, and performances. The variation that exists in today’s quantum computers, even among those of the same underlying hardware, motivate the study of how one device can be clearly differentiated and identified from the next. As a case study, this work focuses on the properties of 25 IBM superconducting, fixed-frequency transmon-based quantum computers that range in age from a few months to approximately 2.5 years. Through the analysis of current and historical quantum computer calibration data, this work uncovers key features within the machines, primarily frequency characteristics of transmon qubits, that can serve as a basis for a unique hardware fingerprint of each quantum computer. 

In June 2022, a group of activists, students, and scholars gathered in Barcelona for the 8th annual International Geographies of Justice Summer Institute (IGJ), Housing Justice in Unequal Cities, co-sponsored by Antipode and the UCLA Institute on Inequality and Democracy. IGJ attendees included people from within movement and activist spaces, academics, and non-profit organizations who share the common vision of working toward housing justice. This article features a collective conversation that took place with IGJ attendees who participated in a public panel discussion attended by activists, community members, and people interested in hearing from local and international panelists about the state and direction of the housing justice movements in Glasgow, Berlin, New York, and Barcelona respectively. Thematically, the conversation held among IGJ attendees to produce the following manuscript focused on the broad and interconnected pillars of housing injustice that repeatedly arose in conversation throughout our time together in Barcelona, including financialization, activism and organizing, and housing justice movements broadly speaking.