Quantum network of superconducting qubits through an optomechanical interface

Yin, Zhang; Yang, Wanli; Sun, Luyan; Duan, Luming

doi:10.1103/physreva.91.012333

Cited by 59 publications

(51 citation statements)

References 47 publications

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“…We apply our technique to two ubiquitous quantum state transfer problems based on STIRAP (stimulated Raman adiabatic passage) [2]. Such protocols have been discussed in systems ranging from atomic cavity QED setups [31,32] to optomechanics [34]. Remarkably, we show that our method works even in the highly constrained protocol introduced by Duan et al [32], where there is only a single time-dependent control field in the Hamiltonian.…”

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confidence: 92%

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Shortcuts to adiabaticity in the presence of a continuum: Applications to itinerant quantum state transfer

et al. 2017

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We present a method for accelerating adiabatic protocols for systems involving a coupling to a continuum, one that cancels both non-adiabatic errors as well as errors due to dissipation. We focus on applications to a generic quantum state transfer problem, where the goal is to transfer a state between a single level or mode, and a propagating temporal mode in a waveguide or transmission line. Our approach enables perfect adiabatic transfer protocols in this setup, despite a finite protocol speed and a finite waveguide coupling. Our approach even works in highly constrained settings, where there is only a single time-dependent control field available.Introduction-Adiabatic quantum evolution provides an efficient and robust way to implement a variety of important quantum operations including state transfer [1][2][3][4][5][6][7], state preparation [8][9][10][11], and even quantum logic gates [12][13][14]. While such protocols are robust against timing errors, they are necessarily slow, making them vulnerable to dissipation or fluctuations. There is thus considerable interest in finding ways to accelerate adiabatic protocols, such that fast evolution is possible without significant non-adiabatic errors [15][16][17][18][19]. These techniques are generally referred to as "shortcuts to adiabaticity" (STA), and involve modifying control fields to suppress the net effect of non-adiabatic errors [20][21][22][23][24][25]. Recent experiments have successfully implemented versions of these strategies [26][27][28][29][30].A key drawback of the transitionless driving strategy and its higher order variants [20][21][22][23][24][25] is that they require the exact diagonalization of a time-dependent Hamiltonian, making them unwieldy for systems with many degrees of freedom. They are thus unsuitable for an important class of quantum state transfer problems, where the goal is to transfer an initial state in a localized system having discrete energy levels to a propagating state in a continuum such as a waveguide or a transmission line (see, e.g., [31][32][33]).In this paper we present a general method for applying STA to the above class of problems. The method is based on first deriving an effective non-Hermitian Hamiltonian, and then constructing dressed-states and modified control sequences that suppress both non-adiabatic errors (due to finite protocol speed) and "dissipative" errors (due to the coupling to the continuum). We apply our technique to two ubiquitous quantum state transfer problems based on STIRAP (stimulated Raman adiabatic passage) [2]. Such protocols have been discussed in systems ranging from atomic cavity QED setups [31,32] to optomechanics [34]. Remarkably, we show that our method works even in the highly constrained protocol introduced by Duan et al. [32], where there is only a single time-dependent control field in the Hamiltonian.Our work represents a substantial advance over previous work using STA to accelerate adiabatic state transfer [20][21][22][23][24][25], as these works did not include a coupling to ...

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confidence: 92%

“…This dark state approach for stationary to itinerant state transfer has been discussed in numerous works [31,32,34].…”

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confidence: 99%

Shortcuts to adiabaticity in the presence of a continuum: Applications to itinerant quantum state transfer

et al. 2017

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“…Since the molecule is embedded in a waveguide, the shift can lead to measurable effects even for light pulses containing few photons. This is a major advantage over existing hybrid proposals that requires strong optical fields [2,14,26,28,31,[36][37][38][39][40][41][42], which will lead to decoherence due to quasiparticles created by photon absorption [43].…”

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confidence: 99%

“…Quantum communication over long distances can, however, only be accomplished through optical means making it a necessity to build light-matter interfaces at optical frequencies [5,13]. This has stimulated immense interest in devising ways of efficiently coupling optical photons to SC systems [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Tremendous success have been achieved in coupling photons to SC qubit at microwave frequencies [30,31], while in the optical domain, only limited indirect coupling has been achieved using transducers [32][33][34].…”

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confidence: 99%

Interfacing Superconducting Qubits and Single Optical Photons Using Molecules in Waveguides

et al. 2017

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We propose an efficient light-matter interface at optical frequencies between a single photon and a superconducting qubit. The desired interface is based on a hybrid architecture composed of an organic molecule embedded inside an optical waveguide and electrically coupled to a superconducting qubit placed near the outside surface of the waveguide. We show that high fidelity, photon-mediated, entanglement between distant superconducting qubits can be achieved with incident pulses at the single photon level. Such a low light level is highly desirable for achieving a coherent optical interface with superconducting qubit, since it minimizes decoherence arising from the absorption of light. 42.50.Ex, 85.25.Cp Rapid progress in engineering and control of their physical properties, have made superconducting (SC) qubits, one of the most promising candidates for future quantum processors [1][2][3][4]. If such processors are connected together into a quantum internet [5], it would allow immense applications ranging from secure communication over long distances [6][7][8] to distributed quantum computation [9][10][11] and advanced protocols for distributed sensing and atomic clocks [12]. Quantum communication over long distances can, however, only be accomplished through optical means making it a necessity to build light-matter interfaces at optical frequencies [5,13]. This has stimulated immense interest in devising ways of efficiently coupling optical photons to SC systems [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Tremendous success have been achieved in coupling photons to SC qubit at microwave frequencies [30,31], while in the optical domain, only limited indirect coupling has been achieved using transducers [32][33][34]. Coherent coupling of quantum fields at optical frequencies to a SC system thus remains an outstanding challenge. A principle obstacle to this is the large mismatch between the energy scales of an optical photon (∼ 1 eV) and a SC qubit (∼ 100 µeV) [30] making the absorption of even a single optical photon a major disturbance for a SC system. In fact such effects are used in SC detectors for detection of optical photons [35]. To suppress such disturbances it is therefore highly desirable to keep the number of optical photons to a minimum.In this letter we propose a scheme to interface optical photons with a SC qubit at light levels involving only a single or a few photons. To achieve this we introduce a hybrid solidstate architecture depicted in Fig. 1(a) comprising, a molecule embedded in an optical waveguide with a SC qubit fabricated near its surface (∼ 100 − 500 nm). In comparison to the magnetic coupling considered previously [23-25, 31, 36-41], a key feature of our scheme is the electric coupling between the molecule and SC qubit. The coupling strength can then be orders of magnitude stronger thus allowing for strong coupling in the system. As the SC qubit we consider a Cooper pair box (CPB) where the two quantum states are defined by a single Cooper pair being on each o...

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“…It has many applications in quantum information science [2][3][4][5][6][7][8][9], testing quantum effects in macroscopic systems [10][11][12][13][14][15][16][17][18][19][20], ultrasensitive sensing [21][22][23][24][25][26], etc. In order to cool mechanical resonator, we should couple it to other cold systems such as cavity mode (optomechanics) [27][28][29], electronic spin (Nitrogen-vacancy centers) [30][31][32], etc.…”

Section: Introductionmentioning

confidence: 99%

Cooling a mechanical resonator to the quantum regime by heating it

Yin

Huang

et al. 2016

Phys. Rev. A

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We consider a mechanical resonator made of diamond, which contains a nitrogen-vacancy center (NV center) locating at the end of the oscillator. A second order magnetic gradient is applied and inducing coupling between mechanical modes and the NV center. By applying proper external magnetic field, the energy difference between NV center electron spin levels can be tuned to match the energy difference between two mechanical modes a and b. A laser is used for continuously initializing the NV center electron spin. The mode a with lower frequency is driven by a thermal bath. We find that the temperature of the mode b is significantly cooled when the heating bath temperature is increased. We discuss the conditions that quantum regime cooling requires, and confirm the results by numerical simulation. Finally we give the intuitive physical explanation on this unusual effect.

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Quantum network of superconducting qubits through an optomechanical interface

Cited by 59 publications

References 47 publications

Shortcuts to adiabaticity in the presence of a continuum: Applications to itinerant quantum state transfer

Shortcuts to adiabaticity in the presence of a continuum: Applications to itinerant quantum state transfer

Interfacing Superconducting Qubits and Single Optical Photons Using Molecules in Waveguides

Cooling a mechanical resonator to the quantum regime by heating it

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