SQuInT 2021 Program

Full Program | Thursday | Friday | All Sessions | Posters | Talks

SESSION 6: Talks at Zoom

2:00pm-2:30pmHeather Lewandowski, University of Colorado Boulder
Preparing to enter the quantum workforce
Abstract Quantum sensing, quantum networking and communication, and quantum computing have attracted significant attention recently, as these quantum technologies could offer significant advantages over existing technologies. In order to accelerate the commercialization of these quantum technologies, the workforce must be equipped with the necessary knowledge and skills. Through a study of the quantum industry, in a series of interviews with 21 U.S. companies carried out in Fall 2019 and from a survey administered to 57 companies through the Quantum Economic Development Consortium (QED-C) in Fall 2020, we describe the types of activities being carried out in the quantum industry, profile the types of jobs that exist, and describe the skills valued across the quantum industry, as well as in each type of job. The current routes into the quantum industry are detailed, providing a picture of the current role of higher education in training the quantum workforce.
2:30pm-2:50pmSepehr Nezami, California Institute of Technology
Permanent of random matrices from representation theory: moments, numerics, concentration, and comments on hardness of boson-sampling
Abstract Computing the distribution of permanents of random matrices has been an outstanding open problem for several decades. In quantum computing, "anti-concentration" of this distribution is an unproven input for the proof of hardness of the task of boson-sampling. We study the permanents of random i.i.d. complex Gaussian matrices, and more broadly, submatrices of random unitary matrices. Using a hybrid representation-theoretic and combinatorial approach, we prove strong lower bounds for all moments of the permanent distribution. We provide substantial evidence that our bounds are close to being tight and constitute accurate estimates for the moments.
  1. Using the Schur-Weyl duality (or the Howe duality), we prove an expansion formula for the 2t-th moment of |Perm M| when M is a random Gaussian matrix, or a minor of a random unitary matrix
  2. We prove a surprising size-moment duality: the 2t-th moment of the permanent of random k by k matrices is equal to the 2k-th moment of the permanent of t by t matrices
  3. We design an algorithm to exactly compute high moments of the permanent of small matrices
  4. We prove lower bounds for arbitrary moments of permanents of random matrices, and conjecture that our lower bounds are close to saturation up to a small multiplicative error.
  5. Assuming our conjectures, we use the large deviation theory to compute the tail of the distribution of log-permanent of Gaussian matrices for the first time.
  6. We argue that it is unlikely that the
2:50pm-3:10pmHolly Tinkey, Georgia Institute of Technology
Experimental demonstration of a transport-enabled entangling gate on trapped ions
Abstract We perform a two-qubit entangling Molmer-Sorensen gate by transporting two co-trapped 40Ca+ ions in a linear surface Paul trap through a stationary, bichromatic laser beam. We measure the Doppler shift of the ions during different segments of transport and observe variations in the ion velocity. We correct for these variations using modifications to the temporal interpolation of the moving trap potential (waveform). We compensate for time-dependent ac Stark shifts during transport with two approaches: the first is a static frequency offset applied to both beam tones, ad the second involves dynamic adjustments of the transport waveform to counter the Stark shift with a variable Doppler shift. We compare the performance of these gates to those realized in stationary potentials. This experiment demonstrates the potential of actively integrating transport into quantum information operations.
3:10pm-3:30pmArshag Danageozian, Louisiana State University
Efficiency-Fidelity Trade-off in a Quantum Error Correcting Engine
Abstract Quantum error correction (QEC) is a procedure by which the quantum state of a system is protected against a known type of noise by preemptively adding redundancy to it using an ancillary system. A major type of noise that regularly appears in almost every implementation of quantum computing and QEC is thermal noise, which is also known to play a central role in quantum thermodynamics (QTD). This fact hints at the applicability of certain QTD statements in the QEC of thermal noise. Such statements have been discussed previously in the context of Maxwell's demon. In this article, we view QEC as a quantum heat engine with a feedback controller (demon). The main task of this engine is to correct the effects of the hot bath (thermal noise) by attempting to close its own cycle with respect to the system state, corresponding to a perfect QEC. We derive Clausius' formulation of the second law in the context of this QEC engine operating with general quantum measurements. For efficient measurements and sufficiently low temperatures of the cold bath, we show that this leads to a fundamental trade-off between the fidelity of the error-corrected system state and the super-Carnot efficiencies that heat engines with feedback controllers have been known to possess.
3:30pm-3:50pmQian Yu, University of California Berkeley
Towards a trapped electron quantum computer
Abstract One of the most established physical implementations of quantum computing is trapped ions in Paul traps. Here we study electrons trapped in Paul traps as an attractive alternative to trapped ions. Their extremely light mass leads to faster operations, their simple two-level spin structure avoids leakage into other energy levels, and they can be manipulated with well-established microwave technology, removing some of the optical engineering challenges required to build a large-scale quantum computer with trapped ions. The first step towards this goal is to trap and detect electrons in a Paul trap. This talk will present our recent results on trapping electrons in a room-temperature quadrupole Paul trap. We loaded cold electrons into the trap by photoionization of atomic calcium and successfully confined them with microwave and static electric fields for several tens of milliseconds. A fraction of these electrons remains trapped longer and show no measurable loss for measurement times up to a second. Electronic excitation of the motion reveals secular frequencies which can be tuned over a range of several tens to hundreds of MHz. Our recent work shows that operating a similar electron Paul trap in a cryogenic environment may provide a platform for quantum computing with trapped electrons.

SQuInT Chief Organizer
Akimasa Miyake, Associate Professor
amiyake@unm.edu

SQuInT Co-Organizer
Brian Smith, Associate Professor
bjsmith@uoregon.edu

SQuInT Local Organizers
Philip Blocher, Postdoc
Pablo Poggi, Research Assistant Professor
Tzula Propp, Postdoc
Jun Takahashi, Postdoc
Cunlu Zhou, Postdoc

SQuInT Founder
Ivan Deutsch, Regents' Professor, CQuIC Director
ideutsch@unm.edu

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