Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session V28: Quantum Measurement with Amplifiers and Photon DetectorsFocus

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Sponsoring Units: DQI Chair: Luke Govia, BBN Technologies Room: BCEC 161 
Thursday, March 7, 2019 2:30PM  3:06PM 
V28.00001: Achieving the Heisenberg limit in quantum metrology using quantum error correction Invited Speaker: Liang Jiang Quantum metrology has many important applications in science and technology, ranging from frequency spectroscopy to gravitational wave detection. Quantum mechanics imposes a fundamental limit on measurement precision, called the Heisenberg limit, which can be achieved for noiseless quantum systems, but is not achievable in general for systems subject to noise. We study how measurement precision can be enhanced through quantum error correction, a general method for protecting a quantum system from the damaging effects of noise. We find a necessary and sufficient condition for achieving the Heisenberg limit using quantum probes subject to Markovian noise, assuming that noiseless ancilla systems are available, and that fast, accurate quantum processing can be performed. When the sufficient condition is satisfied, a quantum errorcorrecting code can be constructed that suppresses the noise without obscuring the signal; the optimal code, achieving the best possible precision, can be found by solving a semidefinite program. 
Thursday, March 7, 2019 3:06PM  3:18PM 
V28.00002: Broadband Amplification and Squeezed Light Generation with Dispersion Engineered Josephson Metamaterial Jack Yanjie Qiu, Kevin O'Brien, Arne Grimsmo, Bharath Kannan, Youngkyu Sung, Philip Krantz, Greg Calusine, Vladimir Bolkhovsky, Terry Philip Orlando, Irfan Siddiqi, Simon Gustavsson, William D Oliver The generation of highlysqueezed states using superconducting amplifiers is a valuable tool for quantum optics and quantum metrology in the microwave domain. The high saturation power of these devices makes them promising candidates for generating highly squeezed states. In this talk, we present our latest results for operating in nondegenerate four wave mixing with dual dispersion engineered Josephson traveling wave parametric amplifier (JTWPA) and discuss our investigations of the JTWPA squeezing performance. 
Thursday, March 7, 2019 3:18PM  3:30PM 
V28.00003: Ideal twomode phase sensitive quantum amplifier: theory Anja Metelmann, Olivia Lanes, TzuChiao Chien, Xi Cao, Gangqiang Liu, Chenxu Liu, David Pekker, Jose Aumentado, Michael Hatridge, Aashish Clerk Quantumlimited amplifiers are crucial for the processing of sensitive quantum information in the microwave world. The textbook (phasesensitive) quantumlimited amplifier is a degenerate parametric amplifier with just a single mode, which comes with the disadvantage of having a fixed gainbandwidth product and of no separation between input and output ports. One would think that adding a second mode to get separation between these ports would always be detrimental, as one introduces an extra degree of freedom and therewith extra noise. Here, we show this is not the case: one can have a twomode phasesensitive amplifier that is ideal with respect to a number of metrics: it has distinct input and output ports, no reflection gain, is quantumlimited and it does not suffer from a gainbandwidth limit. Consequently it is more robust to pumpdepletion effects. In addition, the here presented phasesensitive amplifier produces squeezed output light with an enhanced bandwidth compared to singlemode squeezing setups. The proposed setup could easily be implemented in a range of different superconducting circuit architectures. 
Thursday, March 7, 2019 3:30PM  3:42PM 
V28.00004: Ideal TwoMode Phase Sensitive Quantum Amplifier: Experiment Olivia Lanes, TzuChiao Chien, Xi Cao, Gangqiang Liu, Chenxu Liu, David Pekker, Anja Metelmann, Aashish Clerk, Jose Aumentado, Michael Hatridge Josephson parametric amplifiers, although nearly quantum limited, typically operate in reflection and have a fixed gainbandwidth product. Recently, there have been both theoretical and experimental efforts to address these shortcomings by combining multiple parametric processes within a single multimode device. In this presentation, we focus on using multiple parametric processes to couple two modes of a Josephson Parametric Converter. We will present data which uses paired, detuned gain processes as well as two separate methods of combining gain and photon conversion, all in the same physical device. All three schemes avoid the fixed gainbandwidth product of a singly pumped JPC. We will examine their relative bandwidth, efficiency, and saturation power, as well as the prospects for adding further couplings to a third mode to generate directional amplification. 
Thursday, March 7, 2019 3:42PM  3:54PM 
V28.00005: How Hamiltonian nonlinearities limit the performance of Josephson parametric amplifiers Chenxu Liu, TzuChiao Chien, Michael Hatridge, David Pekker The implementation of a Josephson Parametric Amplifier with a large saturation power is an essential ingredient in achieving efficient signal detection in superconducting quantum computing circuits. Using numerical evolution of the classical nonlinear equations of motion that describe a single nondegenerate gain process in a Josephson Parametric Converter (JPC), we analyze the factors limiting its performance. We demonstrate that the 3rd order coupling between the signal, idler and pump modes effectively generates a complex crossKerr term coupling the signal and idler modes, which can limit device saturation. By comparing properties of the fullnonlinear description of the JPC to descriptions truncated at third, fourth, and higher orders we identify which terms limit the device performance and how to optimize them. 
Thursday, March 7, 2019 3:54PM  4:06PM 
V28.00006: Lumped, Singleended Josephson Parametric Converters for Hamiltonian Engineering TzuChiao Chien, Katarina Cicak, Florent Lecocq, Olivia Lanes, Xi Cao, Chenxu Liu, Gangqiang Liu, David Pekker, Jose Aumentado, Michael Hatridge Quantumlimited parametric amplifiers have become a crucial tool for quantum information processing. However, they have limited bandwidth and saturation power and operate in reflection. We present a design and implementation of a lumped single ended design for the Josephson Parametric Converter (JPC) whose inductance is dominated by the central Josephson Ring Modulator (JRM). Implementation of the JPC as a lumped circuit was facilitated by fabrication in a Nb/AlAlOx/Nb trilayer process incorporating a lowloss amorphous silicon dielectric. This design allows us to more easily engineer the device’s Hamiltonian to control the amplitude of the JRM’s three wave mixing terms which provide gain, and control higher order terms to enhance the saturation power and simplify operation as a directional multiparametric amplifier. 
Thursday, March 7, 2019 4:06PM  4:18PM 
V28.00007: Quantum nonlinear dynamics of nondegenerate parametric amplification beyond the stiffpump approximation Saeed Khan, A. Metelmann, Hakan Tureci In circuit QED, nondegenerate parametric amplification is commonly realized using Josephson Parametric Converter (JPC) based nonlinear circuits. While such systems are often studied within a linear stiffpump approximation, their nonlinear dynamics become important for strong input signals, nonlinearity strengths, and large gain operation. We present a theoretical analysis of nondegenerate parametric amplification going beyond this stiffpump approximation, in particular accounting for the quantum dynamics of the pump mode. Within a regime of weak quantum fluctuations, strongly amplified input signals dominate the depletion of the pump, and the associated compression of amplifier gain is characterized analytically. By further allowing for fluctuations in the pump mode, we find that interactions between the idlersignal subspace and the common pump mode in the nonlinear regime can strongly modify the noise properties of the amplifier. Finally, we analyze nonlinear dynamics in the regime of strong quantum fluctuations. Employing a reduced nonlinear twomode description enables full quantum simulations in this regime where pump depletion can be strongly influenced by amplified vacuum fluctuations, leading to additional gain compression and added noise. 
Thursday, March 7, 2019 4:18PM  4:30PM 
V28.00008: Microwave photomultiplication based on inelastic Cooperpair tunneling Romain Albert, Florian Blanchet, Dibyendu Hazra, Juha Leppaekangas, Salha Jebari, Max Hofheinz When a Josephson junction is embedded in a low impedance circuit Cooper pair transport is usually elastic and the DC voltage across the junction has to be zero to allow for tunneling through the junction. By coupling a DC voltagebiased junction to a microwave circuit, the lightcharge interaction enables inelastic charge transport with photon emission or absorption. The nonlinearity of this lightcharge interaction can be tuned via the characteristic impedance of the microwave circuit and makes it possible to design sources of nonclassical microwave radiation [Westig17, Grimm18], parametric amplifiers [Jebari18] or in our case, a photon multiplier [Leppäkangas18]. 
Thursday, March 7, 2019 4:30PM  4:42PM 
V28.00009: A Superconducting Single Microwave Photon Detector Enabled by Dissipation Engineering  Theory Emmanuel Flurin, Raphael Lescanne, Samuel Deleglise, Zaki Leghtas Superconducting circuits carry microwave photons five orders of magnitude lower in energy than photons of visible light. For their detection, one must bridge the gap between these low energy excitations and signals measurable by standard microwave electronics. In this work, we develop a new class of detectors, based on dissipation engineering, that perform quantum non demolition measurements of travelling microwave wavepackets. We fabricated and measured a single microwave photon detector that imprints on a transmon qubit the passage of a single photon without destroying it. The key advantage of this scheme is its intrinsic robustness against the main decoherence mechanisms found in these circuits, leading to both low dark counts, high detection efficiency and continuous operation, paving the way towards applications in quantum sensing and computing. 
Thursday, March 7, 2019 4:42PM  4:54PM 
V28.00010: A Superconducting Single Microwave Photon Detector Enabled by Dissipation Engineering  Experiment Raphael Lescanne, Emmanuel Flurin, Samuel Deleglise, Zaki Leghtas Superconducting circuits carry microwave photons five orders of magnitude lower in energy than photons of visible light. For their detection, one must bridge the gap between these low energy excitations and signals measurable by standard microwave electronics. In this work, we develop a new class of detectors, based on dissipation engineering, that perform quantum non demolition measurements of travelling microwave wavepackets. We fabricated and measured a single microwave photon detector that imprints on a transmon qubit the passage of a single photon without destroying it. The key advantage of this scheme is its intrinsic robustness against the main decoherence mechanisms found in these circuits, leading to both low dark counts, high detection efficiency and continuous operation, paving the way towards applications in quantum sensing and computing. 
Thursday, March 7, 2019 4:54PM  5:06PM 
V28.00011: Detecting singleInfraredphoton by graphene Josephson junction Kin Chung Fong, Evan Walsh, GilHo Lee, Dmitri K. Efetov, WooChan Jung, KoFan Huang, Thomas A Ohki, Philip Kim, Dirk R. Englund Singlephoton detector is a key enabling technology in quantum information processing, cryotography, and deep space communication. However, detecting low frequency photons is challenging because of their vanishingly small energy. Here we will present the concept of a graphenebased Josephson junction singlephoton detector that can potentially perform in a wide electromagnetic spectrum. We will focus on our experimental results of the Josephson junction switching induced by singleinfraredphoton. We will conclude by its applications in quantum information science, radio astronomy, as well as dark matter detection. 
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